{"text": "Question: Which factor will most likely cause a person to develop a fever?\nAnswer:a bacterial population in the bloodstream", "source": "arc_easy"}
{"text": "Question: Lichens are symbiotic organisms made of green algae and fungi. What do the green algae supply to the fungi in this symbiotic relationship?\nAnswer:food", "source": "arc_easy"}
{"text": "Question: When a switch is used in an electrical circuit, the switch can\nAnswer:stop and start the flow of current.", "source": "arc_easy"}
{"text": "Question: Which of the following is an example of an assistive device?\nAnswer:contact lens", "source": "arc_easy"}
{"text": "Question: Rocks are classified as igneous, metamorphic, or sedimentary according to\nAnswer:how they formed", "source": "arc_easy"}
{"text": "Question: A chewable calcium carbonate tablet is a common treatment for stomach discomfort. Calcium carbonate is most likely used as this type of medicine because calcium carbonate\nAnswer:neutralizes digestive acid.", "source": "arc_easy"}
{"text": "Question: Which two body systems are directly involved in movement?\nAnswer:muscular and skeletal", "source": "arc_easy"}
{"text": "Question: Which change in the state of water particles causes the particles to become arranged in a fixed position?\nAnswer:freezing", "source": "arc_easy"}
{"text": "Question: Earth's core is primarily composed of which of the following materials?\nAnswer:iron", "source": "arc_easy"}
{"text": "Question: Which of the following events during meiosis contributes most to the variation within a species?\nAnswer:segregation of alleles", "source": "arc_easy"}
{"text": "Question: Which of the following was probably most important in the formation of dark, fertile soil that is good for farming?\nAnswer:plant decomposition", "source": "arc_easy"}
{"text": "Question: When igneous rock is changed into metamorphic rock, which form of energy is this process?\nAnswer:heat", "source": "arc_easy"}
{"text": "Question: In humans, the digestion process begins in\nAnswer:the mouth, with chewing and saliva.", "source": "arc_easy"}
{"text": "Question: Which of these items contains only a solution?\nAnswer:a bottle of juice", "source": "arc_easy"}
{"text": "Question: Many natural rock formations change color over time. In Utah, for example, iron oxidized and formed red, orange, and yellow rock. Which of the following is the cause of this change?\nAnswer:chemical weathering", "source": "arc_easy"}
{"text": "Question: A population of small, plant-eating beetles lives in a forest. About half of the beetles are light brown and the others are dark green. If years of drought cause the area to become dry with few trees, what would the beetle population most likely look like after several generations?\nAnswer:It would be mostly light brown beetles.", "source": "arc_easy"}
{"text": "Question: A scientist wanting to document a change in a river's flow pattern should observe a river over a period of\nAnswer:years.", "source": "arc_easy"}
{"text": "Question: Automobile engines built today are designed to be gas efficient. Gas-efficient engines most likely affect a city by reducing\nAnswer:air pollution.", "source": "arc_easy"}
{"text": "Question: A student in an empty classroom shouts, \"Hello!\" Which best explains what the student hears after the shout?\nAnswer:a reflection of sound", "source": "arc_easy"}
{"text": "Question: Which type of energy in gasoline is transformed into mechanical energy in a motorcycle engine?\nAnswer:chemical", "source": "arc_easy"}
{"text": "Question: A student standing near a campfire feels warmer as the fire grows. Which process most likely transfers heat from the campfire to the student?\nAnswer:radiation", "source": "arc_easy"}
{"text": "Question: In snapdragon plants, red flowers are dominant to white flowers. When red-flowered plants are crossed with white-flowered plants, pink flowers are produced. If a researcher wants to produce plants with only white flowers, what color should the parent plants be?\nAnswer:both white", "source": "arc_easy"}
{"text": "Question: Scientists use the term \"light year\" to describe\nAnswer:the distance light travels in one year.", "source": "arc_easy"}
{"text": "Question: Plate movement can form different features on Earth. The movement of tectonic plates can be both a constructive and a destructive force. At which type of plate boundary is new crust formed?\nAnswer:divergent", "source": "arc_easy"}
{"text": "Question: Which group of organisms can show significant trait changes in the shortest period of time?\nAnswer:bacteria", "source": "arc_easy"}
{"text": "Question: Peach trees have sweet-smelling blossoms and produce rich fruit. What is the main purpose of the flowers of a peach tree?\nAnswer:to attract bees for pollination", "source": "arc_easy"}
{"text": "Question: A group of students are researching changes in climate in their region. Which of these would best provide evidence of changes in temperature and rainfall over a period of years?\nAnswer:tree rings", "source": "arc_easy"}
{"text": "Question: Which of these would help to prevent infections from occurring in small cuts and scrapes?\nAnswer:wash the area with warm, soapy water", "source": "arc_easy"}
{"text": "Question: Which best describes why winds at the beach change direction between day and night?\nAnswer:because the temperatures over land and over water change", "source": "arc_easy"}
{"text": "Question: Soil erosion can be best prevented by\nAnswer:building terraces into the sides of a slope.", "source": "arc_easy"}
{"text": "Question: Which of the following properties provides the BEST way to identify a mineral?\nAnswer:hardness", "source": "arc_easy"}
{"text": "Question: Which sequence represents the order of development for many plants?\nAnswer:seed develops inside fruit -> seed is dispersed -> seed germinates -> plant grows", "source": "arc_easy"}
{"text": "Question: When ice cream is left out of a freezer, the ice cream changes from a ___.\nAnswer:solid to a liquid", "source": "arc_easy"}
{"text": "Question: Which equipment will best separate a mixture of iron filings and black pepper?\nAnswer:magnet", "source": "arc_easy"}
{"text": "Question: Which characteristic is shared by all cells?\nAnswer:They need energy.", "source": "arc_easy"}
{"text": "Question: On a small, isolated island, a hurricane destroyed all the trees that produced a large, hard-shelled nut. Which bird population would most likely decrease?\nAnswer:birds with thick, strong beaks", "source": "arc_easy"}
{"text": "Question: A cow and a frog have similar bone structures in their forelimbs. Both have phalanges, radius, ulna, and humerus bones. However, the cow and frog are animals with very different life cycles from each other. Which most likely describes why the body structures of these animals are so similar?\nAnswer:Both descended from a common ancestor.", "source": "arc_easy"}
{"text": "Question: A cell that is unable to import substances required to process chemical energy is most likely a result of a malfunctioning\nAnswer:cell membrane.", "source": "arc_easy"}
{"text": "Question: Which best describes all unicellular organisms?\nAnswer:Every cell performs all life functions.", "source": "arc_easy"}
{"text": "Question: When a transverse wave passes from right to left through a medium, what happens to the particles of the medium?\nAnswer:Particles move back and forth perpendicular to the wave.", "source": "arc_easy"}
{"text": "Question: Which characteristic below most likely accounts for our limited knowledge of galaxies?\nAnswer:their great distance from Earth", "source": "arc_easy"}
{"text": "Question: Decomposers increase the fertility of the soil and prevent dead organisms from building up in the environment. In which way do decomposers make the soil more fertile?\nAnswer:by adding nitrogen", "source": "arc_easy"}
{"text": "Question: When oxygen combines with hydrogen, which substance is formed?\nAnswer:water", "source": "arc_easy"}
{"text": "Question: When plants undergo photosynthesis, a reaction produces sugar, oxygen, and water. During respiration, stored energy from the products of photosynthesis is converted to usable energy. In what form is the energy stored prior to use in respiration?\nAnswer:chemical energy", "source": "arc_easy"}
{"text": "Question: Which of the following is a typical example of a unicellular organism?\nAnswer:bacteria", "source": "arc_easy"}
{"text": "Question: Over geologic time, global mean sea level has varied significantly. Which change is most likely responsible for an increase in global mean sea level?\nAnswer:melting of polar ice caps", "source": "arc_easy"}
{"text": "Question: Which body system is most responsible for the removal of waste?\nAnswer:excretory system", "source": "arc_easy"}
{"text": "Question: In which environment is white fur color an advantage for survival?\nAnswer:arctic tundra", "source": "arc_easy"}
{"text": "Question: Which of these will best separate iron filings from sand?\nAnswer:a magnet", "source": "arc_easy"}
{"text": "Question: Which of these is the chemical symbol for magnesium?\nAnswer:Mg", "source": "arc_easy"}
{"text": "Question: Which of the following is most likely to lead to error in an experiment?\nAnswer:bias", "source": "arc_easy"}
{"text": "Question: Which best describes transportation technology?\nAnswer:a system that is used to move people and products", "source": "arc_easy"}
{"text": "Question: In a gasoline-powered car, chemical energy from gasoline is transformed to make the car move. The motion of the car is what form of energy?\nAnswer:mechanical energy", "source": "arc_easy"}
{"text": "Question: Which characteristic is affected by interactions with the environment?\nAnswer:weight", "source": "arc_easy"}
{"text": "Question: Which is the greatest impact humans have had on the carbon cycle?\nAnswer:burning fossil fuels", "source": "arc_easy"}
{"text": "Question: The floating arrow on a compass always points towards the\nAnswer:north.", "source": "arc_easy"}
{"text": "Question: Which color shirt will reflect the most light on a hot, sunny day?\nAnswer:white", "source": "arc_easy"}
{"text": "Question: A 10 g sample of aluminum and a 10 g sample of iron were each heated by 100 joules of energy. The temperature of the aluminum sample rose 11\u00b0C, while the temperature of the iron sample increased 23\u00b0C. Which statement best accounts for these results?\nAnswer:The specific heat of iron is less than that of aluminum.", "source": "arc_easy"}
{"text": "Question: If its food supply in a field decreases, the mouse population in that field will probably\nAnswer:decrease.", "source": "arc_easy"}
{"text": "Question: Overuse of soil for farming causes local disruptions of several Earth subsystems. Which of these is a part of the biogeochemical cycle that experiences the most severe local disruption?\nAnswer:cycling phosphorus into the soil", "source": "arc_easy"}
{"text": "Question: Which of the following is an example of a physical change but not a chemical change?\nAnswer:A water pipe freezes and cracks on a cold night.", "source": "arc_easy"}
{"text": "Question: While conducting an investigation on refraction, a teacher uses a red laser pointer to show how a beam of light is affected as it passes through several glass objects. The teacher should make sure that the\nAnswer:beam of light does not travel toward the students.", "source": "arc_easy"}
{"text": "Question: One student wrote a report about an investigation in which fertilizer was added to tomato plants. Which information from that student's report would most help a second student repeat the investigation?\nAnswer:the amount of fertilizer added", "source": "arc_easy"}
{"text": "Question: A student wants to look under a heavy rock. Which simple machine would be BEST to use to lift the rock?\nAnswer:Lever", "source": "arc_easy"}
{"text": "Question: Rust is a compound with the formula Fe_{2}O_{3}. Which elements combine to form rust?\nAnswer:iron and oxygen", "source": "arc_easy"}
{"text": "Question: The chemical equation below shows a reaction of copper (Cu) with silver nitrate (AgNO_{3}) yielding silver (Ag) and copper(II) nitrate (Cu(NO_{3})_{2}) Cu + 2AgNO_{3} -> 2Ag + Cu(NO_{3})_{2} Silver and copper(II) nitrate are called the\nAnswer:products.", "source": "arc_easy"}
{"text": "Question: What role does the centromere play in cellular reproduction?\nAnswer:It is the area of attachment for chromatids.", "source": "arc_easy"}
{"text": "Question: If 1 kg of the compound toluene melts at -95\u00b0C, then 500 g of toluene will\nAnswer:melt at -95\u00b0C.", "source": "arc_easy"}
{"text": "Question: A calculation based on the chemical energy of gasoline shows that a car should be able to go 100 miles on a gallon of fuel. When the car was driven on a test track, the car only went 25 miles on a gallon of fuel. What accounts for most of the difference?\nAnswer:the waste heat from the combustion of fuel in the engine", "source": "arc_easy"}
{"text": "Question: A student wants to find the relationship between the diameter of several plastic disks and the circumference of each disk. Which of these types of graphs should be constructed to determine this relationship?\nAnswer:line graph", "source": "arc_easy"}
{"text": "Question: When light is bounced off a mirror, the light is\nAnswer:reflected.", "source": "arc_easy"}
{"text": "Question: Which of the following sentences best explains what happens when puddles evaporate?\nAnswer:The water changes from one form to another.", "source": "arc_easy"}
{"text": "Question: Plants on hills keep dirt in place during a rain storm. Plant roots grow into the dirt and keep the dirt from moving. Why do roots grow into the dirt?\nAnswer:to absorb nutrients", "source": "arc_easy"}
{"text": "Question: In animal skin tissue, cell division is responsible for\nAnswer:growth and repair", "source": "arc_easy"}
{"text": "Question: Which process drives most of the ATP synthesis in a chloroplast?\nAnswer:flow of protons across an electrochemical gradient", "source": "arc_easy"}
{"text": "Question: Which of the following is most consistent with the modern theory of evolution?\nAnswer:Parents pass their physical traits to their offspring; those offspring with traits that help them survive in the environment are able to reproduce.", "source": "arc_easy"}
{"text": "Question: Felicia investigated whether water color affected how fast the water heated in sunlight. She poured tap water into five beakers and placed food coloring in four out of the five beakers. Felicia then used a thermometer to measure the temperature of the water in each of the beakers. Which of these was used as control in her investigation?\nAnswer:testing the beaker of uncolored tap water", "source": "arc_easy"}
{"text": "Question: One process in the formation of sedimentary rocks is when rocks are\nAnswer:broken up and deposited in layers.", "source": "arc_easy"}
{"text": "Question: Western coral snakes have a striped color pattern and are poisonous. Arizona mountain king snakes look like western coral snakes but are not poisonous. The color pattern of the Arizona mountain king snake is an example of\nAnswer:mimicry.", "source": "arc_easy"}
{"text": "Question: Which plant trait is inherited?\nAnswer:the shape of its leaves", "source": "arc_easy"}
{"text": "Question: A student put 200 milliliters (mL) of water into a pot, sets the pot on a burner, and heats the water to boil. When the pot is taken off the burner, it contains only 180 milliliters (mL) of water. What happened to the rest of the water?\nAnswer:It turned into water vapor.", "source": "arc_easy"}
{"text": "Question: Howie put his plants under a plant light. What was he helping his plants do by providing light?\nAnswer:make food", "source": "arc_easy"}
{"text": "Question: Which lists the diameter of the planets in order from smallest to largest?\nAnswer:Mercury, Mars, Venus, Earth", "source": "arc_easy"}
{"text": "Question: The aloe plant can absorb a lot of water during a rain shower. The extra water is stored in its leaves. The ability to store water in its leaves is most likely an adaptation to which type of environment?\nAnswer:one with dry conditions", "source": "arc_easy"}
{"text": "Question: When stratospheric ozone levels are reduced, the amount of ultraviolet radiation hitting Earth increases. Ozone depletion is most often caused\nAnswer:when fluorocarbons are released into the atmosphere.", "source": "arc_easy"}
{"text": "Question: Owen tested a physical property of a mineral. He rubbed a mineral sample on a piece of white tile. The mineral left a red mark on the tile. Which of the following physical properties of the mineral was Owen most likely testing?\nAnswer:streak", "source": "arc_easy"}
{"text": "Question: Which of these animals has a young form that looks the most like the adult form?\nAnswer:human", "source": "arc_easy"}
{"text": "Question: Two tectonic plates pushing toward each other cause intense heat and pressure in Earth's crust. Into which will crust material be changed by heat and pressure?\nAnswer:metamorphic rock", "source": "arc_easy"}
{"text": "Question: A student states that plants grow taller when grown in natural light than they do in artificial light. Which method is the best way to determine if the statement is fact or opinion?\nAnswer:conduct a controlled experiment", "source": "arc_easy"}
{"text": "Question: Which object is powered by an electrical circuit?\nAnswer:a flashlight", "source": "arc_easy"}
{"text": "Question: Which concept supports the endosymbiotic origin of complex, eukaryotic double-membrane structures?\nAnswer:Mitochondria and chloroplasts arise from preexisting mitochondria and chloroplasts.", "source": "arc_easy"}
{"text": "Question: Which of these human activities most relies on high-quality soil?\nAnswer:Growing crops", "source": "arc_easy"}
{"text": "Question: What is an example of a shelter in an ecosystem?\nAnswer:a raccoon in a hollow log", "source": "arc_easy"}
{"text": "Question: Some areas of the world are experiencing more desert-like conditions. This change most favors survival of species with the ability to do which of the following?\nAnswer:become dormant for long periods", "source": "arc_easy"}
{"text": "Question: Roger poured water over a pile of sand. Some of the sand washed away. This process is similar to which of the following?\nAnswer:The erosion of the walls of a canyon", "source": "arc_easy"}
{"text": "Question: When an earthquake wave passes from the crust to the mantle, the wave\nAnswer:changes speed.", "source": "arc_easy"}
{"text": "Question: A student wraps a wire around an iron nail. The student then connects the wire to a battery. The nail attracts another nail and they stick together. What force holds the two nails together?\nAnswer:magnetic force", "source": "arc_easy"}
{"text": "Question: Natural processes cause rapid and slow changes to Earth's surface. Which event causes changes to Earth's surface most rapidly?\nAnswer:an earthquake shaking the ground", "source": "arc_easy"}
{"text": "Question: Since 1961, Nevada has led the United States in production of which resource?\nAnswer:gold", "source": "arc_easy"}
{"text": "Question: A class is testing the effect of exercise on heart rate. The heart rate of two students before exercise is compared to their heart rate after running around a track. Which procedure will most likely help the class correctly compare the results of the two students?\nAnswer:have the students run for the same amount of time", "source": "arc_easy"}
{"text": "Question: Which interaction within an ecosystem is characterized by gradual change from one community of organisms to another?\nAnswer:succession", "source": "arc_easy"}
{"text": "Question: The continuous changes of a seed to an adult plant that produces seeds is known as a\nAnswer:life cycle.", "source": "arc_easy"}
{"text": "Question: When someone plays the flute, sound is produced because the air in the flute is\nAnswer:vibrating.", "source": "arc_easy"}
{"text": "Question: Scientists compared Pluto with other objects in the solar system and found that Pluto is smaller than Earth's moon. This finding caused scientists to question whether Pluto is a planet because\nAnswer:the other planets are much larger than Pluto", "source": "arc_easy"}
{"text": "Question: When an iron nail wrapped in a copper wire is attached to a circuit, it forms\nAnswer:an electromagnet.", "source": "arc_easy"}
{"text": "Question: Which gas accounts for the largest percentage of greenhouse gases in the atmosphere?\nAnswer:water vapor", "source": "arc_easy"}
{"text": "Question: Which human body system attacks viruses and bacteria once they have invaded the body?\nAnswer:immune", "source": "arc_easy"}
{"text": "Question: The atoms that make up oxygen gas\nAnswer:share two covalent bonds.", "source": "arc_easy"}
{"text": "Question: A student wants to cut a piece of string for a class activity. The length of the string is measured BEST in which units?\nAnswer:Centimeters", "source": "arc_easy"}
{"text": "Question: If the atomic mass number of an atom is 35, which statement is most accurate?\nAnswer:The number of protons does not equal the number of neutrons.", "source": "arc_easy"}
{"text": "Question: Biotic components need to be recycled through an ecosystem. Which type of organisms are best able to recycle nutrients back into the ecosystem?\nAnswer:decomposers", "source": "arc_easy"}
{"text": "Question: Roger visited his grandfather who lives on a farm. While he was there, he helped his grandfather move hay out of the barn. As Roger worked in the barn he began sneezing. Which system of the body most likely caused Roger to sneeze?\nAnswer:immune", "source": "arc_easy"}
{"text": "Question: Why should plants be included in investigations about the water cycle?\nAnswer:Plants are part of the water cycle through the process of transpiration.", "source": "arc_easy"}
{"text": "Question: Which statement best identifies a basic need of all animals?\nAnswer:They need to eat.", "source": "arc_easy"}
{"text": "Question: Which of the following describes an instinctive behavior?\nAnswer:a behavior that an animal is born knowing how to do", "source": "arc_easy"}
{"text": "Question: Which of these provide the best evidence that life could develop on Mars?\nAnswer:its ice and organic molecules", "source": "arc_easy"}
{"text": "Question: The primary reason that plants are important for an ecosystem is because they\nAnswer:provide energy for consumers.", "source": "arc_easy"}
{"text": "Question: Energy from the Sun reaches Earth by\nAnswer:radiation.", "source": "arc_easy"}
{"text": "Question: Scientists study the current conditions of many solar system objects to gain insight into conditions early in the history of Earth. Which phenomenon most closely models current theories of early Earth?\nAnswer:hundreds of active volcanoes on Io", "source": "arc_easy"}
{"text": "Question: Jonathan places a pot of water on a stove. As the water boils, how does the state of the water change?\nAnswer:from liquid to gas", "source": "arc_easy"}
{"text": "Question: Animal cells obtain energy by\nAnswer:absorbing nutrients.", "source": "arc_easy"}
{"text": "Question: Which illness is associated with a weakened immune system in the body?\nAnswer:cancer", "source": "arc_easy"}
{"text": "Question: In the human kidney, urea from the blood is filtered through the glomerular membrane into a nephron. The movement of urea across this membrane occurs without an input of energy. Which factor is the most likely reason urea absorption does not require energy?\nAnswer:a concentration gradient", "source": "arc_easy"}
{"text": "Question: The greatest amount of diversity can be found among which type of organism?\nAnswer:bacteria", "source": "arc_easy"}
{"text": "Question: Which energy type is common enough in Nevada to make a significant contribution to the renewable energy needs of the state?\nAnswer:geothermal", "source": "arc_easy"}
{"text": "Question: Until recently the Grand Canyon was thought to be about 5-6 million years old. Recently a scientist gathered data and wrote a paper for a scientific journal that indicated the canyon is about 17 million years old. Before this new information about the canyon is accepted, which of these needs to occur?\nAnswer:Many scientists need to evaluate the data.", "source": "arc_easy"}
{"text": "Question: Which human trait is most likely inherited from a parent?\nAnswer:height", "source": "arc_easy"}
{"text": "Question: Foam weather stripping is often placed in the frames of doors and windows in a home. What is the purpose of this weather stripping?\nAnswer:The weather stripping reduces heat loss due to convection.", "source": "arc_easy"}
{"text": "Question: The items listed below were found in a science classroom. * a heart made of plastic with many of its parts labeled * clay formed to look like Earth and other planets * a giant plastic plant cell with removable cell parts These items are all examples of\nAnswer:models", "source": "arc_easy"}
{"text": "Question: For a technology project, Kyle came up with an idea to build a model bridge. He wants his bridge to span 50 cm and to support a 1 kg object. According to the engineering design process, which of the following should be Kyle's next step?\nAnswer:research the different designs of bridges", "source": "arc_easy"}
{"text": "Question: Light travels fastest through which of the following?\nAnswer:a vacuum", "source": "arc_easy"}
{"text": "Question: Different systems of the human body perform different functions. Which system takes oxygen from the air to be moved by the circulatory system?\nAnswer:the respiratory system", "source": "arc_easy"}
{"text": "Question: A solar cell turns sunlight into another form of energy. A solar cell is most like what natural structure?\nAnswer:a plant's leaves", "source": "arc_easy"}
{"text": "Question: The Sun appears to move across the sky each day, rising in the east and setting in the west. What causes this apparent motion?\nAnswer:the rotation of Earth on its axis", "source": "arc_easy"}
{"text": "Question: What causes a blue block to appear blue in the sunlight?\nAnswer:Only blue light is reflected by the block.", "source": "arc_easy"}
{"text": "Question: A student determined the density of different bars of soap. Which should the student most likely do to check the accuracy of the results?\nAnswer:repeat the experiment", "source": "arc_easy"}
{"text": "Question: Which method below would be the best way to determine if an egg, plastic foam, a piece of wood, or a candle would float on water?\nAnswer:observing each object in water", "source": "arc_easy"}
{"text": "Question: Liam lives in the Northern Hemisphere of Earth and plays in the snow in December. His friend lives in the Southern Hemisphere of Earth and plays at the beach in December. What is the best explanation for why this is possible?\nAnswer:tilt of Earth on its axis", "source": "arc_easy"}
{"text": "Question: A scientist needs to take a picture of the well-ordered arrangements of the atoms and molecules within a substance. Which of the following instruments would be best for the scientist to use?\nAnswer:an electron microscope.", "source": "arc_easy"}
{"text": "Question: Gold atoms can be identified based on the number of which subatomic particles?\nAnswer:protons", "source": "arc_easy"}
{"text": "Question: Which is needed for both boiling and melting to occur?\nAnswer:heat", "source": "arc_easy"}
{"text": "Question: Which of the following is an example of genetic engineering?\nAnswer:Inserting a gene into plants that makes them resistant to insects.", "source": "arc_easy"}
{"text": "Question: Which of the following is an example of a container that is filled with a pure substance rather than with a mixture?\nAnswer:a balloon filled with helium", "source": "arc_easy"}
{"text": "Question: Which best describes the role of the esophagus in digestion?\nAnswer:It carries food from the mouth to the stomach.", "source": "arc_easy"}
{"text": "Question: Which change is most likely caused by a thunderstorm?\nAnswer:a stream flooding", "source": "arc_easy"}
{"text": "Question: Which is an example of an organism that has been selectively bred for a particular genetic trait?\nAnswer:chickens that lay large eggs", "source": "arc_easy"}
{"text": "Question: Which of these can be described as a system of stars, gases, dust, and other matter that orbits a common center of gravity?\nAnswer:a galaxy", "source": "arc_easy"}
{"text": "Question: The Florida Bog Frog (Lithobates okaloosae) inhabits shallow stream overflows in three counties in Florida. With such a small geographic habitat, any change in the frog's environment could cause drastic changes in the population. Which would most likely affect the frog population if acid rain changed the pH of the water?\nAnswer:Tadpoles would be unable to survive.", "source": "arc_easy"}
{"text": "Question: Which function do kidneys provide to maintain homeostasis?\nAnswer:the removal of nitrogenous wastes from the blood", "source": "arc_easy"}
{"text": "Question: While running, leg muscles work to move leg bones, and the skin helps to\nAnswer:regulate body temperature.", "source": "arc_easy"}
{"text": "Question: Rolanda is growing tomato plants in her garden. She has created a compost pile and has been adding compost around her tomato plants to help fertilize them. Compost is solid waste in which organic material is broken down by microorganisms in the presence of oxygen to where it can be safely stored, handled, and applied to the environment. On what does Rolanda primarily rely in order for composting to work?\nAnswer:decomposers", "source": "arc_easy"}
{"text": "Question: Some students were on a tour exploring the inside of a cave. While the students were in the cave, they realized they heard an echo every time that they spoke. Which most likely caused the echo to occur?\nAnswer:the reflection of the sound waves", "source": "arc_easy"}
{"text": "Question: A scientist uses angstrom units to measure the distance between two points. The scientist is most likely measuring the distance between two\nAnswer:atoms.", "source": "arc_easy"}
{"text": "Question: Based on the evidence available at the time, early models of the solar system stated that all objects in space orbited Earth. In the 16th century, an astronomer reevaluated the evidence and proposed a model of the solar system that is still in use. What part of this model corrected the mistake in previous solar system models?\nAnswer:The Sun is at the center of this model.", "source": "arc_easy"}
{"text": "Question: The hormone insulin is secreted by the pancreas. Which activity is most likely to trigger an increase in the levels of insulin circulating in the blood?\nAnswer:eating", "source": "arc_easy"}
{"text": "Question: In gym class a student kicks a soccer ball high into the air. As the ball goes upward, which type of energy is increasing?\nAnswer:potential energy", "source": "arc_easy"}
{"text": "Question: Which best describes the orbit of the Moon around Earth?\nAnswer:elliptical with a period of about one month", "source": "arc_easy"}
{"text": "Question: In any physical or chemical process, what two quantities are always conserved?\nAnswer:matter and total energy", "source": "arc_easy"}
{"text": "Question: The nucleus of MOST atoms consists of\nAnswer:protons and neutrons", "source": "arc_easy"}
{"text": "Question: The complete removal of decomposers from an ecosystem will have the greatest effect on which of the following?\nAnswer:the recycling of nutrients", "source": "arc_easy"}
{"text": "Question: In an accurate diagram of the solar system, which object would be shown closest to Earth?\nAnswer:the Moon", "source": "arc_easy"}
{"text": "Question: Typically, sedimentary rocks are formed\nAnswer:from materials that settle.", "source": "arc_easy"}
{"text": "Question: Which renewable resource is used with photovoltaic cells to produce electricity?\nAnswer:solar energy", "source": "arc_easy"}
{"text": "Question: Which will most likely happen to a solid substance that is heated?\nAnswer:It will melt.", "source": "arc_easy"}
{"text": "Question: A scientist observes an unusual activity while studying bacterial cells. Using scientific inquiry to investigate the activity will enable the scientist to\nAnswer:evaluate different explanations of the behavior.", "source": "arc_easy"}
{"text": "Question: In order to survive, all organisms must have\nAnswer:energy", "source": "arc_easy"}
{"text": "Question: Which observation of a plant supports the inference that photosynthesis can take place?\nAnswer:a green color", "source": "arc_easy"}
{"text": "Question: To safely conduct an experiment using chemicals, what should students always do?\nAnswer:Wear safety goggles.", "source": "arc_easy"}
{"text": "Question: Infections may be caused by\nAnswer:microorganisms", "source": "arc_easy"}
{"text": "Question: Which are two parts of the carbon cycle?\nAnswer:photosynthesis and respiration", "source": "arc_easy"}
{"text": "Question: The digestive system breaks food into simple substances that the body can use. What system carries these simple substances from the digestive system to other parts of the body?\nAnswer:circulatory", "source": "arc_easy"}
{"text": "Question: A student conducts an experiment using a common but potentially harmful bacteria culture. After working with the bacteria, which is the most important safety practice to follow?\nAnswer:wash hands and tabletops thoroughly", "source": "arc_easy"}
{"text": "Question: Which of these environmental changes goes on for months or years?\nAnswer:drought", "source": "arc_easy"}
{"text": "Question: Erin placed her shamrock plant in a dark corner. Soon she saw that the leaves had tilted toward her window. What did the plant need most from the window?\nAnswer:sunlight during the day", "source": "arc_easy"}
{"text": "Question: Which gravitational pull has the greatest influence on Earth's tides?\nAnswer:the gravitational pull between Earth and the Moon", "source": "arc_easy"}
{"text": "Question: One key physical process in beach formation is wave action. Sand is deposited on beaches as waves break onto the shoreline and the energy from the wave scatters. Which type of energy is most used by wave action to modify the shape of the beaches?\nAnswer:mechanical", "source": "arc_easy"}
{"text": "Question: A student is asked to bring something that feels rough to class. Which would be BEST for him to bring?\nAnswer:Sandpaper", "source": "arc_easy"}
{"text": "Question: What tool would be used to examine a fingerprint?\nAnswer:a hand lens", "source": "arc_easy"}
{"text": "Question: Which of the following is a mineral?\nAnswer:diamond", "source": "arc_easy"}
{"text": "Question: During a rainstorm, leaves wash down a gully on a hillside. The water slows down at the foot of the hill and fans out, depositing the leaves. What geologic structure is formed in a similar way?\nAnswer:a delta", "source": "arc_easy"}
{"text": "Question: The change in fur color of the Arctic hare from brown in the summer to white in the winter is an example of\nAnswer:camouflage.", "source": "arc_easy"}
{"text": "Question: Which sense is used to tell if there is sugar in a glass of tea?\nAnswer:Taste", "source": "arc_easy"}
{"text": "Question: The surface of Earth is covered by a relatively thin layer of water called the\nAnswer:hydrosphere", "source": "arc_easy"}
{"text": "Question: All organisms contain DNA and RNA. What are the subunits of DNA and RNA?\nAnswer:nucleotides", "source": "arc_easy"}
{"text": "Question: How does ice change the shape of rocks?\nAnswer:It breaks the rocks by expanding in openings.", "source": "arc_easy"}
{"text": "Question: Which property of Earth's interior keeps the innermost part in a solid state?\nAnswer:extremely high pressure", "source": "arc_easy"}
{"text": "Question: Diseases that can be transmitted between organisms are\nAnswer:infectious.", "source": "arc_easy"}
{"text": "Question: The transfer of thermal energy from one object to another is known as\nAnswer:heat.", "source": "arc_easy"}
{"text": "Question: Which part of the body carries out the function of copying DNA?\nAnswer:cells", "source": "arc_easy"}
{"text": "Question: The atomic mass of an atom is\nAnswer:the sum of protons and neutrons.", "source": "arc_easy"}
{"text": "Question: Different species of carnivorous animals that share the same habitat in an ecosystem may\nAnswer:compete for food", "source": "arc_easy"}
{"text": "Question: Which scientist is best known for studying plants and animals?\nAnswer:Charles Darwin", "source": "arc_easy"}
{"text": "Question: Green plants get the energy they need to make food from\nAnswer:sunlight", "source": "arc_easy"}
{"text": "Question: The movement of soil by wind or water is called\nAnswer:erosion", "source": "arc_easy"}
{"text": "Question: Arctic areas are covered with snow and ice for much of the year. Which color rabbits would be safest from foxes there?\nAnswer:white", "source": "arc_easy"}
{"text": "Question: The ratio of an object's mass to its volume is its\nAnswer:density.", "source": "arc_easy"}
{"text": "Question: As the hawk population increases in an ecosystem, the deer mouse population will most likely decrease as a result of\nAnswer:increase in predators.", "source": "arc_easy"}
{"text": "Question: Greenhouse gases in the atmosphere trap heat near Earth's surface. Which of these is a greenhouse gas?\nAnswer:water vapor", "source": "arc_easy"}
{"text": "Question: What happens during photosynthesis?\nAnswer:Plants change light energy into food energy.", "source": "arc_easy"}
{"text": "Question: Which is an example of a chemical reaction?\nAnswer:The burning of wood", "source": "arc_easy"}
{"text": "Question: A baby kit fox grows to become an adult with a mass of over 3.5 kg. What factor will have the greatest influence on this kit fox's survival?\nAnswer:the conditions of the fox's habitat", "source": "arc_easy"}
{"text": "Question: Hydrochloric acid is added to a beaker containing a piece of zinc. As a result, zinc chloride is formed and hydrogen gas is released. This is an example of\nAnswer:a chemical reaction", "source": "arc_easy"}
{"text": "Question: Which part of a plant produces the seeds?\nAnswer:flower", "source": "arc_easy"}
{"text": "Question: Which of the following is found in all living organisms?\nAnswer:cell", "source": "arc_easy"}
{"text": "Question: What is the role of decomposers in a food chain?\nAnswer:They break down dead organic matter.", "source": "arc_easy"}
{"text": "Question: Copernicus changed the way people viewed the solar system by\nAnswer:claiming Earth is in orbit about the Sun.", "source": "arc_easy"}
{"text": "Question: Which part of the electromagnetic spectrum can humans sense without using equipment or technology?\nAnswer:visible light", "source": "arc_easy"}
{"text": "Question: The nervous system is composed of cells, tissues, and organs. Which is a cell of the nervous system?\nAnswer:neuron", "source": "arc_easy"}
{"text": "Question: A shallow container of salt water is placed in sunlight for a day. Which is the most likely result?\nAnswer:Only the water will evaporate and the salt will remain in the container.", "source": "arc_easy"}
{"text": "Question: Which of these will best separate a saltwater solution?\nAnswer:allowing the water to evaporate", "source": "arc_easy"}
{"text": "Question: Mrs. Henderson's class has five small, covered boxes. One contains perfume; another contains dried onions. There is also a box of pine needles, a box of lemon pieces, and a box with a paper towel wet with vanilla flavoring. Which should they do to get the best information about what is in each box?\nAnswer:Smell the boxes.", "source": "arc_easy"}
{"text": "Question: Which features are physical properties of an iron nail?\nAnswer:conducts heat, magnetic, solid", "source": "arc_easy"}
{"text": "Question: Which item would a magnet attract?\nAnswer:iron nail", "source": "arc_easy"}
{"text": "Question: Which human activity is most harmful to the natural environment?\nAnswer:cutting down a rain forest", "source": "arc_easy"}
{"text": "Question: The process of digestion breaks down proteins into smaller molecules that are used to rebuild other proteins. During digestion, proteins undergo\nAnswer:chemical changes.", "source": "arc_easy"}
{"text": "Question: Blood is composed of different cell types that transport nutrients and wastes throughout the body. Because of this, blood is classified as\nAnswer:a tissue.", "source": "arc_easy"}
{"text": "Question: What should a student do when a glass beaker shatters during a laboratory experiment?\nAnswer:Notify the teacher.", "source": "arc_easy"}
{"text": "Question: An astronomical unit (AU) refers to the distance between\nAnswer:Earth and the Sun.", "source": "arc_easy"}
{"text": "Question: An organ pipe produces a musical note same number of nitrogen gas molecules. with a wavelength of 2.72 m. What is the frequency of this note if the speed of sound is 348 m/s?\nAnswer:128 Hz", "source": "arc_easy"}
{"text": "Question: Which of the following allows the planets to stay in orbit?\nAnswer:the Sun's gravity", "source": "arc_easy"}
{"text": "Question: Which of these involves the formation of a new chemical substance?\nAnswer:rusting of an iron chain", "source": "arc_easy"}
{"text": "Question: Water causes weathering when it\nAnswer:erodes rock in its path.", "source": "arc_easy"}
{"text": "Question: Which of these statements about nonrenewable resources is true?\nAnswer:They can take millions of years to form.", "source": "arc_easy"}
{"text": "Question: Which statement best identifies a living thing that depends on another living thing to survive?\nAnswer:A moose eats a plant.", "source": "arc_easy"}
{"text": "Question: A student is playing with a small toy boat on a pond. The student throws a rock in the pond. This creates waves that move the boat toward the shore. The boat moves toward the shore because the waves transfer\nAnswer:energy.", "source": "arc_easy"}
{"text": "Question: A geologist finds a layer of shale near the surface from a certain time period. Nearby, the geologist finds the same layer of shale, but it is deeper underground than the first layer. What might have caused the difference in the depth of the shale layer?\nAnswer:a fault", "source": "arc_easy"}
{"text": "Question: The pull of gravity on Earth is caused by\nAnswer:the mass of Earth.", "source": "arc_easy"}
{"text": "Question: In which type of rock are fossils generally found?\nAnswer:sedimentary", "source": "arc_easy"}
{"text": "Question: Structural geologists study rock formations to determine the type of environment in which the rocks formed and the events that shaped the rocks. Paleontologists study fossils found in rock formations. Scientists in both these fields have a common interest in discovering the\nAnswer:history and processes of Earth.", "source": "arc_easy"}
{"text": "Question: A simple machine that helps move a flag up a flagpole is\nAnswer:a pulley", "source": "arc_easy"}
{"text": "Question: Which cellular structure allows nutrients to pass into cells?\nAnswer:membrane", "source": "arc_easy"}
{"text": "Question: An example of a renewable resource is\nAnswer:wood.", "source": "arc_easy"}
{"text": "Question: Minerals are formed by which process?\nAnswer:magma cooling", "source": "arc_easy"}
{"text": "Question: Which of these best defines the term \"pollutant\"?\nAnswer:any substance that is harmful to the environment", "source": "arc_easy"}
{"text": "Question: The periodic table of the elements is systematically organized according to the\nAnswer:structure of the atoms of the elements.", "source": "arc_easy"}
{"text": "Question: Which human body system produces the hormones that regulate growth?\nAnswer:endocrine", "source": "arc_easy"}
{"text": "Question: Repeated exposure to extremely loud sounds can reduce hearing ability by direct damage to which structures?\nAnswer:the sensory neurons in the ears", "source": "arc_easy"}
{"text": "Question: What does a mirror do to light that causes objects to appear backwards?\nAnswer:reflects", "source": "arc_easy"}
{"text": "Question: The formation of the mineral halite is most likely to occur by which process?\nAnswer:the evaporation of seawater", "source": "arc_easy"}
{"text": "Question: A student wants to design an experiment regarding the behavior of crickets. Which is the best question to ask to begin the experiment?\nAnswer:Do crickets chirp more during the day or at night?", "source": "arc_easy"}
{"text": "Question: Decomposers are organisms that eat and break down dead plant and animal material. Which organism is a decomposer?\nAnswer:bacteria", "source": "arc_easy"}
{"text": "Question: An area received six inches of snow during the winter. Before the snow can continue through the water cycle as ground water or runoff, it must first ___.\nAnswer:melt", "source": "arc_easy"}
{"text": "Question: New vaccines for diseases are being developed all the time. How do vaccines most likely help people?\nAnswer:Vaccines help prevent illnesses.", "source": "arc_easy"}
{"text": "Question: The cell cycle describes the processes that take place as a cell\nAnswer:forms new cells.", "source": "arc_easy"}
{"text": "Question: A company that makes fences started using a new material instead of wood. The new material will last longer than wood. What is the most likely benefit of the new material?\nAnswer:The new material can save money on replacements.", "source": "arc_easy"}
{"text": "Question: Which best explains how the Appalachian Mountains formed?\nAnswer:tectonic plates collided", "source": "arc_easy"}
{"text": "Question: Which is a source of sound?\nAnswer:a vibration", "source": "arc_easy"}
{"text": "Question: Which natural material is best for making a table?\nAnswer:wood that is sturdy", "source": "arc_easy"}
{"text": "Question: A class is studying textures and collects several samples. Which of these items would the students most likely use magnification to study?\nAnswer:hair", "source": "arc_easy"}
{"text": "Question: Over several years, a scientist successfully isolates a species of flower for white color. This year, when the new generation of flowers blooms, one yellow flower is found in the population. Which is the best reason for the appearance of a new flower color within the species?\nAnswer:genetic mutation", "source": "arc_easy"}
{"text": "Question: What type of precipitation occurs when raindrops freeze as they fall?\nAnswer:sleet", "source": "arc_easy"}
{"text": "Question: In the atomic model that includes a nucleus, the positive charge is\nAnswer:concentrated in the center of the model.", "source": "arc_easy"}
{"text": "Question: A student used two long wires to connect a lightbulb to a battery. The student noticed that as soon as the circuit was complete, a nearby compass started to point in a direction other than north. The compass pointed in a different direction because it was reacting to the\nAnswer:magnetic field produced by the electric current.", "source": "arc_easy"}
{"text": "Question: The production of sweat is typically a response to an increase in the body's\nAnswer:temperature.", "source": "arc_easy"}
{"text": "Question: Which of the following converts electrical energy into motion?\nAnswer:electric fan", "source": "arc_easy"}
{"text": "Question: What happens at the boiling point of a substance?\nAnswer:liquid becomes a gas", "source": "arc_easy"}
{"text": "Question: How do producers get energy?\nAnswer:using the sun to make food", "source": "arc_easy"}
{"text": "Question: In an investigation, a student wants to see how a ball is affected by rolling it over a surface covered with sandpaper. In preparation for the trial, the student makes a list of the possible conditions that could affect the investigation. The student is most likely listing the\nAnswer:variables.", "source": "arc_easy"}
{"text": "Question: If two organisms are classified in different orders but are in the same class, which of these statements is true?\nAnswer:The organisms are in the same phylum.", "source": "arc_easy"}
{"text": "Question: Why do mountain climbers at high elevations use oxygen tanks to help them breathe?\nAnswer:The atmosphere is less dense at higher elevations so there is less oxygen available.", "source": "arc_easy"}
{"text": "Question: The students were told that the net applied force from the engine was the same for each vehicle tested. Based on this information, which vehicle had the greatest acceleration (a = F/m)?\nAnswer:vehicle 1", "source": "arc_easy"}
{"text": "Question: Which metric unit is used to describe an object's length?\nAnswer:centimeter (cm)", "source": "arc_easy"}
{"text": "Question: Which is a process that occurs during photosynthesis?\nAnswer:Plants take in carbon dioxide and release oxygen.", "source": "arc_easy"}
{"text": "Question: The work of which scientist serves as the basis for many procedures used in agriculture, such as selective breeding of plants?\nAnswer:Mendel", "source": "arc_easy"}
{"text": "Question: A student is investigating which type of soil is best for growing tomato plants from seeds. The student plants four tomato seeds in each of three different containers of soil. Which step of the procedure would help the student get the most reliable results?\nAnswer:Change only the soil type in each container.", "source": "arc_easy"}
{"text": "Question: In many caves, rock formations include stalactites and stalagmites. Where does the rock in these formations come from?\nAnswer:dissolved minerals", "source": "arc_easy"}
{"text": "Question: A person named Leonardo da Vinci studied many things including animals, geology, clouds, and flight. His study of birds helped him design the first parachute. Everything he saw made him ask how and why. Which human quality most likely made this person want to study many different things?\nAnswer:curiosity", "source": "arc_easy"}
{"text": "Question: What is the main reason we can see the Moon?\nAnswer:The Moon reflects the light from the Sun.", "source": "arc_easy"}
{"text": "Question: Which of these events have the most influence on regional climate?\nAnswer:ocean trade winds", "source": "arc_easy"}
{"text": "Question: If a scientist wants the medical community to revise old information and use new research findings in the treatment of a disease, it would be best to present the information\nAnswer:at a physicians' conference.", "source": "arc_easy"}
{"text": "Question: David planted ten corn seeds in sandy soil and ten corn seeds in clay soil. He kept both groups of plants at room temperature, gave them the same amount of water, and placed them all in the same sunny room. Which of the following questions is David most able to answer with his experiment?\nAnswer:Do corn plants grow better in sandy soil or in clay soil?", "source": "arc_easy"}
{"text": "Question: Which geologic feature most likely forms when an oceanic tectonic plate is slowly subducted beneath a continental tectonic plate?\nAnswer:ocean trench", "source": "arc_easy"}
{"text": "Question: A glacier retreats leaving bare rocks. Lichens begin to live on the rocks. The lichens produce an acid that starts to break down the rocks. How will this process affect the environment?\nAnswer:It will begin the process of building soil.", "source": "arc_easy"}
{"text": "Question: During protein synthesis, mRNA is translated into three-base sequences representing amino acids. What signals the ribosome to begin translating the mRNA into a new amino acid sequence?\nAnswer:a codon", "source": "arc_easy"}
{"text": "Question: Phobos is one of two large objects that orbit the planet Mars. Because Phobos orbits Mars, Phobos should be classified as which type of body?\nAnswer:moon", "source": "arc_easy"}
{"text": "Question: Water at 20\u00b0C in an uncovered pan is evaporating very slowly. What could be done to the water to make it evaporate more quickly?\nAnswer:Heat it.", "source": "arc_easy"}
{"text": "Question: Which rapid changes are caused by heat from inside Earth?\nAnswer:volcanoes", "source": "arc_easy"}
{"text": "Question: Which tool is most responsible for preventing future pandemics of smallpox?\nAnswer:worldwide vaccination for smallpox", "source": "arc_easy"}
{"text": "Question: After which event will ecological succession most likely happen?\nAnswer:a forest fire", "source": "arc_easy"}
{"text": "Question: Sir Isaac Newton determined that white light is made up of all the colors of the rainbow. What did he use to discover this phenomenon?\nAnswer:a prism", "source": "arc_easy"}
{"text": "Question: Which characteristic is most common among animals living in a cold climate?\nAnswer:layers of fat", "source": "arc_easy"}
{"text": "Question: Species are classified based on their characteristics. Which characteristic identifies two organisms as members of one species? The organisms\nAnswer:can produce fertile offspring.", "source": "arc_easy"}
{"text": "Question: A student hypothesizes that the amount of water a plant receives will affect how long it grows before reaching maturity. To test this hypothesis, the student will need\nAnswer:several identical plant seeds.", "source": "arc_easy"}
{"text": "Question: One example of matter is\nAnswer:water", "source": "arc_easy"}
{"text": "Question: If a classroom experiment involves the use of several unidentified chemical solutions, which factor would be most important in maintaining safety during the experiment?\nAnswer:The classroom would have good ventilation.", "source": "arc_easy"}
{"text": "Question: Vein deposits of gold and silver are often formed in areas that have experienced which geologic process?\nAnswer:igneous intrusion", "source": "arc_easy"}
{"text": "Question: Cells that conduct messages are known as\nAnswer:nerve cells", "source": "arc_easy"}
{"text": "Question: The boiling of water results in a physical change in matter from\nAnswer:liquid to gas.", "source": "arc_easy"}
{"text": "Question: What do playing a guitar, banging a drum, and dropping a pebble in the water have in common?\nAnswer:They all cause vibrations.", "source": "arc_easy"}
{"text": "Question: Which object below is gaining stored energy?\nAnswer:A rubber band that is being stretched", "source": "arc_easy"}
{"text": "Question: At room temperature, what state of matter is copper?\nAnswer:solid", "source": "arc_easy"}
{"text": "Question: All of the following events occur during prophase in mitosis except\nAnswer:crossing over.", "source": "arc_easy"}
{"text": "Question: A seed of a plant sticks to the fur of an animal as it walks by. How has the animal most likely helped the plant?\nAnswer:by spreading the seed", "source": "arc_easy"}
{"text": "Question: Which part of a plant is used to absorb sunlight during photosynthesis?\nAnswer:leaf", "source": "arc_easy"}
{"text": "Question: You wish to closely observe a small insect. Which tool is the best to use?\nAnswer:a magnifying glass", "source": "arc_easy"}
{"text": "Question: The interaction of the skeletal and muscular systems to produce locomotion is coordinated by which human body system?\nAnswer:nervous", "source": "arc_easy"}
{"text": "Question: A student flips a coin four times. It lands \"heads\" up three times. The student concludes that the coin will land \"heads\" up three times out of four. What will make the conclusion more accurate?\nAnswer:flipping the coin twenty more times", "source": "arc_easy"}
{"text": "Question: Which mineral has six-sided transparent crystals that will scratch glass?\nAnswer:quartz", "source": "arc_easy"}
{"text": "Question: Which best describes a proton?\nAnswer:positively charged and part of the nucleus", "source": "arc_easy"}
{"text": "Question: The difference between the atomic number of an element and the element's atomic mass is the number of\nAnswer:neutrons.", "source": "arc_easy"}
{"text": "Question: Which step will most likely ensure that the results of an investigation are valid?\nAnswer:comparing the results with those of other scientists", "source": "arc_easy"}
{"text": "Question: What is formed when a sodium atom and chlorine atom react chemically?\nAnswer:a compound", "source": "arc_easy"}
{"text": "Question: Which of these is an example of an endothermic process?\nAnswer:first-aid instant cold pack", "source": "arc_easy"}
{"text": "Question: The distance from Earth to the Sun is about 150,000,000 km. What abbreviation do scientists use to describe this distance?\nAnswer:astronomical unit (AU)", "source": "arc_easy"}
{"text": "Question: In New York State, the longest period of daylight occurs during which month?\nAnswer:June", "source": "arc_easy"}
{"text": "Question: Which trait does a puppy inherit from its parents?\nAnswer:fur color and pattern", "source": "arc_easy"}
{"text": "Question: Which material is most easily recycled at school?\nAnswer:notebook paper", "source": "arc_easy"}
{"text": "Question: Plants make sugars in the presence of sunlight in a process called photosynthesis. What form of carbon do the plants take in for this process?\nAnswer:carbon dioxide", "source": "arc_easy"}
{"text": "Question: The sun is a star of average size and brightness. From Earth, the sun appears as a round, yellow object in the daytime sky. At night, we see other stars. They appear as tiny points of light. Why does the sun appear larger than stars that we see at night?\nAnswer:The sun is closer to Earth than other stars, making the sun appear larger.", "source": "arc_easy"}
{"text": "Question: A drain cleaner consists of sodium hydroxide and aluminum. When the drain cleaner is added to water, bubbles of hydrogen are produced, and the solution becomes very hot. Which of these best describes what happens to form the bubbles when the cleaner is added to water? F\nAnswer:chemical reaction", "source": "arc_easy"}
{"text": "Question: John has diabetes. Which of the following should he be careful about eating or drinking?\nAnswer:fruit juice", "source": "arc_easy"}
{"text": "Question: Within a substance, atoms that collide frequently and move independently of one another are most likely in a\nAnswer:gas.", "source": "arc_easy"}
{"text": "Question: Which object best reflects light?\nAnswer:white floor", "source": "arc_easy"}
{"text": "Question: The gravitational attraction of the Moon causes which effect on Earth?\nAnswer:ocean tides", "source": "arc_easy"}
{"text": "Question: A forest was cleared for the building of a resort, but before construction began, secondary succession set in. Which of these describes why secondary succession appeared so rapidly?\nAnswer:The soil components remained for plants to grow.", "source": "arc_easy"}
{"text": "Question: Which object is made to reflect light?\nAnswer:mirror", "source": "arc_easy"}
{"text": "Question: A car may produce many forms of energy from the fuel it uses. Which indicates that a car does not use fuel with 100% efficiency?\nAnswer:The car engine gets hot.", "source": "arc_easy"}
{"text": "Question: After nitrogen becomes part of the lithosphere, what is the next change that nitrogen will undergo?\nAnswer:fixed by bacteria in the soil", "source": "arc_easy"}
{"text": "Question: Which of the following would be more likely to pollute a river?\nAnswer:spreading fertilizer near the river", "source": "arc_easy"}
{"text": "Question: For two organisms to be classified as the same species, they must produce offspring that are\nAnswer:fertile.", "source": "arc_easy"}
{"text": "Question: Which sentence best describes the organization of the heart?\nAnswer:The heart is an organ made up of different types of tissues, each of which has different types of cells.", "source": "arc_easy"}
{"text": "Question: Which stage in the reptile life cycle is most like the birth of a lion cub?\nAnswer:hatching from an egg", "source": "arc_easy"}
{"text": "Question: What would be the best way to determine the role of squirrels in a forest ecosystem?\nAnswer:make field observations of squirrels in their natural habitat", "source": "arc_easy"}
{"text": "Question: Which of the following systems breaks food into nutrients that can be used by the body?\nAnswer:digestive", "source": "arc_easy"}
{"text": "Question: Barry collected four different rocks. The rock with the GREATEST mass will feel the ___.\nAnswer:heaviest", "source": "arc_easy"}
{"text": "Question: Which of the following is not an inherited trait of humans?\nAnswer:favorite food", "source": "arc_easy"}
{"text": "Question: When a person chews, saliva from the mouth mixes with starches in food. These starches begin to turn into sugars. Changing starches into sugars is best described as\nAnswer:a chemical change.", "source": "arc_easy"}
{"text": "Question: Which of these renewable resources results in an increase in pollution when used to produce energy?\nAnswer:biomass", "source": "arc_easy"}
{"text": "Question: Granite is an igneous rock. Which of these describes what usually happens to granite after it is weathered, broken into small particles, buried deep underground, and compacted?\nAnswer:The granite becomes a new rock type.", "source": "arc_easy"}
{"text": "Question: The features below are all present on Earth. Which feature could also be found on the Moon?\nAnswer:crater", "source": "arc_easy"}
{"text": "Question: What is the highest temperature that water can reach in a pot on a stove?\nAnswer:100\u00b0C", "source": "arc_easy"}
{"text": "Question: In 2004 the Hubble space telescope captured images of distant star clusters, each containing about a million stars. These star clusters were most likely part of which structure?\nAnswer:a galaxy", "source": "arc_easy"}
{"text": "Question: Where is most of the mass of the atom located?\nAnswer:in the nucleus", "source": "arc_easy"}
{"text": "Question: Which situation is the best example of ecological succession?\nAnswer:One species replaces another species in an ecosystem.", "source": "arc_easy"}
{"text": "Question: The BEST way to tell the DIFFERENCE between an oak and a maple tree is to compare the\nAnswer:shape of the leaves.", "source": "arc_easy"}
{"text": "Question: Which example describes a learned behavior in a dog?\nAnswer:sitting on command", "source": "arc_easy"}
{"text": "Question: In a lab investigation, a student notes that two metal blocks have the same mass. Based on this observation, if the two blocks were put on opposite sides of a balance, they would best represent\nAnswer:balanced forces.", "source": "arc_easy"}
{"text": "Question: A scientist was investigating why several fish caught from a local stream displayed similar mutations. He found that the water temperature of the stream was elevated since an industrial plant began discharging heated water into the stream. The scientist concluded that increased water temperature during the egg phase led to the mutation in the fish. According to this conclusion, the mutation was caused by\nAnswer:an environmental condition.", "source": "arc_easy"}
{"text": "Question: Solar radiation has a part in the water cycle by\nAnswer:changing water to a vapor.", "source": "arc_easy"}
{"text": "Question: A student sets a block at the top of a wooden ramp. The student pushes the block. As the block slides down the ramp, it slows down and then comes to a stop. What force causes the block to slow down?\nAnswer:the force of friction", "source": "arc_easy"}
{"text": "Question: Which of these explains how a trench can form?\nAnswer:two oceanic plates converging", "source": "arc_easy"}
{"text": "Question: Pepsin is an enzyme that acts in the stomach for protein digestion. Which of these is most likely the main role of pepsin in this metabolic reaction?\nAnswer:to speed up the rate of reaction", "source": "arc_easy"}
{"text": "Question: Sodium chloride, commonly called \"table salt,\" is made up of sodium and chlorine that have been combined chemically. Which term best describes sodium chloride?\nAnswer:Compound", "source": "arc_easy"}
{"text": "Question: Katia was listening to music on the radio. In order for the sound to be produced, the electrical energy must be converted into which type of energy?\nAnswer:mechanical energy", "source": "arc_easy"}
{"text": "Question: Studies of snail fossils in Egypt indicate that areas of Egypt that are now desert were once thriving savannahs approximately 130,000 years ago. What does the presence of these fossils indicate about the area of Egypt that was thriving 130,000 years ago?\nAnswer:There was more humidity in the air.", "source": "arc_easy"}
{"text": "Question: Which statement identifies an energy source as renewable?\nAnswer:Wind, because it is always available.", "source": "arc_easy"}
{"text": "Question: A wet towel will dry when it is left in the Sun. Which process occurs to make this happen?\nAnswer:evaporation", "source": "arc_easy"}
{"text": "Question: Otto pushed a toy car across a floor. The car traveled fast across the wood, but it slowed to a stop on the carpet. Which best explains what happened when the car reached the carpet?\nAnswer:Friction increased.", "source": "arc_easy"}
{"text": "Question: Eye color is a physical trait. Which statement best explains why a child has a specific eye color?\nAnswer:Eye color is an inherited trait.", "source": "arc_easy"}
{"text": "Question: Manganese has an atomic number of 25 and an atomic mass of 55 amu. How many particles are found in its nucleus?\nAnswer:55", "source": "arc_easy"}
{"text": "Question: Students researched monkeys at a zoo. They recorded the monkeys' traits and behaviors. This investigation activity is best described as\nAnswer:observing.", "source": "arc_easy"}
{"text": "Question: The fur of an arctic fox turns from brown to white as winter approaches. This is an example of\nAnswer:camouflage", "source": "arc_easy"}
{"text": "Question: Which is an example of a chemical change?\nAnswer:a rusting car fender", "source": "arc_easy"}
{"text": "Question: Which statement is describing climate?\nAnswer:Last winter was colder than normal.", "source": "arc_easy"}
{"text": "Question: Scientists have categorized trees based on whether they keep or lose their leaves each year. Another logical way to categorize trees is based on the\nAnswer:type of fruit that is produced.", "source": "arc_easy"}
{"text": "Question: Which resource is considered nonrenewable?\nAnswer:fossil fuels", "source": "arc_easy"}
{"text": "Question: Sand and iron particles that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles?\nAnswer:Use a magnet to separate them.", "source": "arc_easy"}
{"text": "Question: Which habitat on Earth would probably 28 add the greatest amount of water to the water cycle through evaporation?\nAnswer:warm ocean", "source": "arc_easy"}
{"text": "Question: Which of these actions will change a sedimentary rock, such as limestone, into a metamorphic rock, such as marble?\nAnswer:heat from magma", "source": "arc_easy"}
{"text": "Question: A loaf of bread is baking in a pan in a 350\u00b0 F oven. What would cause a burn to a hand the quickest because of its low specific heat?\nAnswer:the metal pan", "source": "arc_easy"}
{"text": "Question: A student poured some sugar into a glass of water. After the water was stirred, no solid sugar remained in the glass. Which statement best describes what happened?\nAnswer:The sugar dissolved in water to form a solution.", "source": "arc_easy"}
{"text": "Question: The magnitude of the gravitational force between two planets depends on the\nAnswer:distance between the planets.", "source": "arc_easy"}
{"text": "Question: The fossils that are found in the oldest layers of sedimentary rock were formed which types of organisms?\nAnswer:only organisms that lived in the sea", "source": "arc_easy"}
{"text": "Question: A snail's shell provides the snail with\nAnswer:protection.", "source": "arc_easy"}
{"text": "Question: Since green plants make their own food, they are called\nAnswer:producers", "source": "arc_easy"}
{"text": "Question: Which metalloid is used in solar cells and computer chips?\nAnswer:silicon", "source": "arc_easy"}
{"text": "Question: The best evidence that two land areas were once connected is the discovery that both land masses\nAnswer:have similar types of rocks and fossils.", "source": "arc_easy"}
{"text": "Question: Rachel purchased a kit for making a skateboard ramp. Which of the following is most important to have for putting the ramp together?\nAnswer:a set of instructions for the kit materials", "source": "arc_easy"}
{"text": "Question: What is the smallest particle of the element gold (Au) that can still be classified as gold?\nAnswer:atom", "source": "arc_easy"}
{"text": "Question: Which best describes the function of the small intestine?\nAnswer:digestion and absorption of food", "source": "arc_easy"}
{"text": "Question: A forest is flooded when a natural dam breaks, leaving the forest floor under two meters of water. Which animal is most affected by the flooding?\nAnswer:a rabbit", "source": "arc_easy"}
{"text": "Question: Which object will most likely be attracted to a magnet?\nAnswer:metal nail", "source": "arc_easy"}
{"text": "Question: At what temperature does pure water boil?\nAnswer:100\u00b0C", "source": "arc_easy"}
{"text": "Question: Animals that eat both plant matter and meat are referred to as\nAnswer:omnivores.", "source": "arc_easy"}
{"text": "Question: Corals are animals that live in tropical oceans. Fossils of corals are found in Ohio. What does the presence of coral fossils suggest about how the environment of Ohio has changed over time?\nAnswer:Ohio was once covered by warm seas.", "source": "arc_easy"}
{"text": "Question: Alex looked at an electric toothbrush that had a plug with three metal prongs. Why are these prongs made out of metal?\nAnswer:Metal is a conductor and completes a circuit when you plug it into the outlet.", "source": "arc_easy"}
{"text": "Question: Where is an igneous rock such as pumice most likely formed?\nAnswer:near a volcano", "source": "arc_easy"}
{"text": "Question: Why are many telescopes used far from cities?\nAnswer:The light from the cities makes it hard to see stars.", "source": "arc_easy"}
{"text": "Question: Where do plants get energy from to make food?\nAnswer:sunlight", "source": "arc_easy"}
{"text": "Question: Which of the following is most likely to cause water to change from one state of matter to another state of matter?\nAnswer:a change in air temperature", "source": "arc_easy"}
{"text": "Question: When a soccer player kicks a ball, which two systems work directly with the muscular system?\nAnswer:nervous and skeletal", "source": "arc_easy"}
{"text": "Question: Which two activities are carried out by all species of living things?\nAnswer:grow and reproduce", "source": "arc_easy"}
{"text": "Question: Which best explains why a person infected with bacteria may have a fever?\nAnswer:The body is responding to fight off the bacteria.", "source": "arc_easy"}
{"text": "Question: Most of the concentration of which gas results from the activity of producer organisms?\nAnswer:oxygen", "source": "arc_easy"}
{"text": "Question: What is determined by the speed that Earth rotates on its axis?\nAnswer:the length of a day", "source": "arc_easy"}
{"text": "Question: The spectrum of visible light can be seen in a rainbow because white light is\nAnswer:refracted and dispersed.", "source": "arc_easy"}
{"text": "Question: Kate sees a full moon. About how much time will go by before the next full moon?\nAnswer:one month", "source": "arc_easy"}
{"text": "Question: The sediments found in a riverbed are most likely a result of which action on nearby rock?\nAnswer:weathering", "source": "arc_easy"}
{"text": "Question: The most common way humans contribute to the extinction of organisms is by\nAnswer:destruction of habitat.", "source": "arc_easy"}
{"text": "Question: Which of the following is an example of matter changing state?\nAnswer:heating a pan of water until the water is all gone", "source": "arc_easy"}
{"text": "Question: A car runs out of fuel while traveling on a level road and eventually comes to a stop. Which of the following best explains why the car stops?\nAnswer:Some of the energy of the car was lost to friction.", "source": "arc_easy"}
{"text": "Question: Which of the following best represents one particular stage in a life cycle?\nAnswer:a seed sprouting", "source": "arc_easy"}
{"text": "Question: Which process of the water cycle transports water from plants to clouds?\nAnswer:transpiration", "source": "arc_easy"}
{"text": "Question: Sulfur scrubbers are devices installed in coal-fired power plants. Sulfur scrubbers reduce the emission of sulfur dioxide. What environmental problem are sulfur scrubbers most likely trying to address?\nAnswer:acid rain", "source": "arc_easy"}
{"text": "Question: Which system of the human body provides protection to most of the major organs?\nAnswer:skeletal system", "source": "arc_easy"}
{"text": "Question: A scientist developed a model that described the actions of DNA in the cell nuclei, which helped explain how traits were inherited. Which scientist helped develop this model?\nAnswer:Watson", "source": "arc_easy"}
{"text": "Question: Which item is designed to change electrical energy into heat energy?\nAnswer:Hand dryer", "source": "arc_easy"}
{"text": "Question: Which characteristic is the best example of an inherited trait?\nAnswer:eye color", "source": "arc_easy"}
{"text": "Question: Which correctly arranges three scientific terms-theory, law, and hypothesis-from least to most accepted or tested?\nAnswer:hypothesis, theory, law", "source": "arc_easy"}
{"text": "Question: The metal lid on a glass jar is hard to open, so it is held under warm, running water. What causes the jar to open easily after it was held under the water?\nAnswer:The metal lid expanded under warm water.", "source": "arc_easy"}
{"text": "Question: A dung beetle is an insect that gathers waste from animals, rolls it into a compact ball, lays eggs in it, and buries it in the soil. This gives the eggs a warm, safe place to hatch and provides a food source for the developing larvae. Which impact does the dung beetle most likely have on its ecosystem?\nAnswer:It helps return nutrients to the soil.", "source": "arc_easy"}
{"text": "Question: After playing outside on a cold day, Jaime went inside to wash his hands. Although the water was normal temperature, he noticed that it felt warmer than usual. What would explain this phenomenon?\nAnswer:The water from the faucet had a higher temperature than his skin.", "source": "arc_easy"}
{"text": "Question: What is the relationship between tissues and organs?\nAnswer:Organs are made from different types of tissues.", "source": "arc_easy"}
{"text": "Question: What will be the most likely result for some species of animals with the continued burning of rain forests in Africa?\nAnswer:destruction of their habitats", "source": "arc_easy"}
{"text": "Question: Earthworms live underground in the soil. As they move through the soil, they create tunnels. The tunnels help improve the soil. Plants grow better in soil that has earthworms. Which statement explains how earthworm tunnels help plants?\nAnswer:Earthworm tunnels loosen the soil so plant roots can easily grow", "source": "arc_easy"}
{"text": "Question: Which tools are best used to determine the speed of a turtle as it walks along a path?\nAnswer:Stopwatch and meter stick", "source": "arc_easy"}
{"text": "Question: Which tool would a student use to measure wind speed?\nAnswer:anemometer", "source": "arc_easy"}
{"text": "Question: Why would explorers use a compass when traveling to unknown lands?\nAnswer:to locate a direction to travel", "source": "arc_easy"}
{"text": "Question: Which measurement tool is used to find the volume of a small piece of granite?\nAnswer:graduated cylinder", "source": "arc_easy"}
{"text": "Question: What form of energy causes an ice cube to melt?\nAnswer:heat", "source": "arc_easy"}
{"text": "Question: Which characteristic is most beneficial for an animal living on a snowy mountain?\nAnswer:thick fur", "source": "arc_easy"}
{"text": "Question: Which of the following is a property of CO2 gas?\nAnswer:It is colorless.", "source": "arc_easy"}
{"text": "Question: Which rapid changes can be caused by storms?\nAnswer:landslides and flooding", "source": "arc_easy"}
{"text": "Question: Which is an example of a chemical reaction?\nAnswer:nails rusting", "source": "arc_easy"}
{"text": "Question: Which unit of measurement can be used to describe the length of a desk?\nAnswer:centimeters", "source": "arc_easy"}
{"text": "Question: The incompleteness of the fossil record results primarily from which phenomenon?\nAnswer:the rarity with which organic remains are exposed to fossil-forming conditions", "source": "arc_easy"}
{"text": "Question: A student conducts an investigation. In order to make a valid conclusion, she must\nAnswer:have a testable hypothesis.", "source": "arc_easy"}
{"text": "Question: The bonding of oxygen to red blood cells is important to the body because it enables the body to\nAnswer:perform aerobic respiration in cells.", "source": "arc_easy"}
{"text": "Question: Some of Earth's water is stored underground in porous rock formations known as aquifers. Which of these could use up groundwater in aquifers?\nAnswer:excessive pumping from wells", "source": "arc_easy"}
{"text": "Question: All plants and animals have mechanisms that\nAnswer:transport nutrients", "source": "arc_easy"}
{"text": "Question: Which is the best tool to measure the angles of a triangular object?\nAnswer:a protractor", "source": "arc_easy"}
{"text": "Question: All living organisms are dependent on plants because plants\nAnswer:are producers", "source": "arc_easy"}
{"text": "Question: Compared to other stars in our galaxy, which is the best description of our Sun?\nAnswer:average size, average temperature", "source": "arc_easy"}
{"text": "Question: While studying the relationship between number of trees and amount of atmospheric oxygen, which of the following would be most important to take into account?\nAnswer:contributions to atmospheric oxygen from sources other than trees", "source": "arc_easy"}
{"text": "Question: A student is working on a science project display for the school science fair. To best communicate why her conclusions are valid, what should be included on the display?\nAnswer:a complete write-up of her experimental method and data collected", "source": "arc_easy"}
{"text": "Question: Which of the following describes asexual reproduction?\nAnswer:binary fission in an amoeba", "source": "arc_easy"}
{"text": "Question: Which scientist is known for his genetics experiments with pea plants?\nAnswer:Gregor Mendel", "source": "arc_easy"}
{"text": "Question: On a cold, cloudy day, the local weather forecaster predicts that a high-pressure system will be moving into the area in the next 24 hours. Which weather conditions will this system most likely bring to the area?\nAnswer:sunny", "source": "arc_easy"}
{"text": "Question: What determines if twins are identical?\nAnswer:their genes", "source": "arc_easy"}
{"text": "Question: Which of these processes is a conversion made by solar panels?\nAnswer:radiant energy to electrical energy", "source": "arc_easy"}
{"text": "Question: In fruit flies, red eyes are dominant over sepia eyes. A male with red eyes is crossed with a female with sepia eyes producing first generation offspring that all had sepia eyes. What does this indicate about the flies that were crossed?\nAnswer:The male is heterozygous and the female is homozygous recessive for the trait.", "source": "arc_easy"}
{"text": "Question: Acid rain caused by industrial pollution greatly reduces the number of trees in a forested region that is home to a particular species of bird. How might this decrease in the number of trees most likely affect this bird population?\nAnswer:The population will decrease due to lack of resources.", "source": "arc_easy"}
{"text": "Question: Which of these is the main function of a cell wall?\nAnswer:To provide support", "source": "arc_easy"}
{"text": "Question: Which sentence about the periodic table of elements is true?\nAnswer:Metals are found on the left side of the periodic table.", "source": "arc_easy"}
{"text": "Question: Salt concentration, water temperature, plankton, and the whale shark might all be used in a description of an ocean\nAnswer:ecosystem.", "source": "arc_easy"}
{"text": "Question: Rocks can be classified many different ways, including as igneous, metamorphic, and sedimentary. This classification is based on the\nAnswer:origin of the rocks.", "source": "arc_easy"}
{"text": "Question: A mountain range has hills around its edges. How are the mountains and hills alike?\nAnswer:Both are taller than the land around them.", "source": "arc_easy"}
{"text": "Question: Human muscle cells need nutrients and oxygen during exercise. The human body is able to meet the needs of the muscle cells during exercise by increasing\nAnswer:circulation.", "source": "arc_easy"}
{"text": "Question: Phyllis investigated what happened when she added some different substances to water. Which substance can combine with water to form a solution?\nAnswer:sugar", "source": "arc_easy"}
{"text": "Question: Fossil fuels are considered a nonrenewable resource because they\nAnswer:take a long period of time to form.", "source": "arc_easy"}
{"text": "Question: A student is growing some plants for an experiment. She notices small white spots on the leaves. Which tool should she use to get a better look at the spots?\nAnswer:hand lens", "source": "arc_easy"}
{"text": "Question: Why are seals able to live off the coast of Antarctica while frogs, snakes, and panthers are not?\nAnswer:Seals have fur and blubber.", "source": "arc_easy"}
{"text": "Question: How are the functions of a carbohydrate and a lipid similar?\nAnswer:Both are a source of energy.", "source": "arc_easy"}
{"text": "Question: Traveling in opposite directions, buses A and B are passing each other at the relative speed of 25 km/h, while a passenger on bus A walks toward the back of the bus at the speed of 5 km/h. What is the velocity of the passenger on bus A relative to bus B?\nAnswer:20 km/h in the direction of bus A", "source": "arc_easy"}
{"text": "Question: A student drops a ball. Which force causes the ball to fall to the ground?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: Hydrogen is located on the left side of the periodic table in the same column as the alkali metals, but it has characteristics of a nonmetal. Which of the following is a physical property of hydrogen?\nAnswer:Hydrogen is a gas at room temperature.", "source": "arc_easy"}
{"text": "Question: In an experiment, a scientist named Pavlov rang a bell before he fed his dogs, which made the dogs drool. Soon the dogs would drool when they heard the bell, even if they did not receive any food. What type of response did the dogs exhibit?\nAnswer:a learned behavior", "source": "arc_easy"}
{"text": "Question: Which invention will best help people travel quickly to far away places?\nAnswer:airplane", "source": "arc_easy"}
{"text": "Question: What is an environmental threat posed by oil and gas acquisition and transport that is not posed by the acquisition and transport of the energy resources uranium, and wood?\nAnswer:pipeline leaks", "source": "arc_easy"}
{"text": "Question: Some plant species are more tolerant of acidic soil than others. The tolerant species are favored in areas affected by which consequence of human activity?\nAnswer:mixing of pollutants with rain", "source": "arc_easy"}
{"text": "Question: Which resource has the most potential for production of renewable electric energy?\nAnswer:geothermal", "source": "arc_easy"}
{"text": "Question: A layer of solid brittle rock comprises the outer 100 kilometers of Earth. This layer, which contains both the crust and the upper mantle, is called the\nAnswer:lithosphere.", "source": "arc_easy"}
{"text": "Question: During its lifetime, which object is known to change in brightness, color, and temperature?\nAnswer:star", "source": "arc_easy"}
{"text": "Question: What causes a free falling object to accelerate?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: What is the main source of energy that drives all weather patterns?\nAnswer:the Sun", "source": "arc_easy"}
{"text": "Question: What is one factor that contributes to seasons occurring in New York State?\nAnswer:the tilt of Earth on its axis", "source": "arc_easy"}
{"text": "Question: Which cell part is correctly paired with its function?\nAnswer:nucleus-controls cell activities", "source": "arc_easy"}
{"text": "Question: A meeting of scientists, called a symposium, occurs every year to share recent research about the atmosphere of Earth. This symposium mainly serves which purpose in science?\nAnswer:to discuss the meaning of new discoveries", "source": "arc_easy"}
{"text": "Question: A wind turbine primarily uses which type of energy?\nAnswer:mechanical", "source": "arc_easy"}
{"text": "Question: A rubber band will make a sound when it is\nAnswer:vibrated.", "source": "arc_easy"}
{"text": "Question: What would a warm air mass over the ocean most likely cause?\nAnswer:rainfall", "source": "arc_easy"}
{"text": "Question: The Moon is visible to observers on Earth because of\nAnswer:reflected sunlight", "source": "arc_easy"}
{"text": "Question: Which illness is always caused by an infection?\nAnswer:influenza", "source": "arc_easy"}
{"text": "Question: Jonny climbed an apple tree. How are Jonny and the apple tree similar to each other?\nAnswer:Both are made of cells.", "source": "arc_easy"}
{"text": "Question: What are the names of the products in the chemical equation shown below? HCl + NaHCO_{3} -> NaCl + CO_{2} + H_{2}O\nAnswer:sodium chloride, carbon dioxide, and water", "source": "arc_easy"}
{"text": "Question: A ball is tossed up in the air and it comes back down. The ball comes back down because of\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: Timber companies can best manage the number of trees in forests by\nAnswer:planting trees to replace what they cut down.", "source": "arc_easy"}
{"text": "Question: The formation of the Himalayan Mountains is one example of land features caused by compressive forces. Which action most likely led to the formation of these mountains?\nAnswer:colliding plates", "source": "arc_easy"}
{"text": "Question: What abiotic factor would most likely signal a population of birds that it is time to migrate from north to south?\nAnswer:decrease in sunlight", "source": "arc_easy"}
{"text": "Question: A greenhouse is used as a model of the atmosphere. Which of the following cannot be demonstrated by the model?\nAnswer:changes in greenhouse gases", "source": "arc_easy"}
{"text": "Question: A light bulb manufacturer claims its light bulb is \"twice as bright\" per unit of electrical energy consumed as the leading light bulb. If this claim is correct, what factor must be accurately compared between the two bulbs?\nAnswer:how much heat each bulb releases", "source": "arc_easy"}
{"text": "Question: In the 17th century, Gregor Mendel crossed pea plants with different traits and observed the results in their offspring. To which of these did Mendel contribute most directly with his work?\nAnswer:science of heredity and variation", "source": "arc_easy"}
{"text": "Question: How does the appearance of a constellation change during the night?\nAnswer:Its position appears to shift relative to the horizon.", "source": "arc_easy"}
{"text": "Question: The freezing and thawing action of water affects a rock by\nAnswer:gradually breaking down the rock into smaller pieces.", "source": "arc_easy"}
{"text": "Question: Delilah put a container of water in the freezer and left it there overnight. The next morning she saw that the water in the container had changed to ice. Which of the following statements best explains why the water changed to ice?\nAnswer:Heat was taken away from the water.", "source": "arc_easy"}
{"text": "Question: Earth's rotation (turning on its axis) causes\nAnswer:day and night.", "source": "arc_easy"}
{"text": "Question: Which of the following climates has cold winters and hot summers?\nAnswer:temperate", "source": "arc_easy"}
{"text": "Question: What form of energy is being used when a person pushes a wooden block across the floor?\nAnswer:mechanical", "source": "arc_easy"}
{"text": "Question: Which action is an example of good water management?\nAnswer:turning off the faucet when brushing teeth", "source": "arc_easy"}
{"text": "Question: An Earth year is the length of time it takes for\nAnswer:Earth to revolve once around the Sun", "source": "arc_easy"}
{"text": "Question: Which land form results when carbonic acid in groundwater seeps through rock and dissolves limestone?\nAnswer:caverns", "source": "arc_easy"}
{"text": "Question: Which part of a DNA molecule represents encoded information?\nAnswer:guanine", "source": "arc_easy"}
{"text": "Question: Early scientists most likely saw a discharge of electricity for the first time when observing a\nAnswer:lightning storm", "source": "arc_easy"}
{"text": "Question: In humans, the amount of sugar in blood is controlled by the release of a hormone called insulin. This process is an example of\nAnswer:regulation", "source": "arc_easy"}
{"text": "Question: It is necessary to add a day to the calendar every four years because\nAnswer:the revolution of Earth is not exactly 365 days.", "source": "arc_easy"}
{"text": "Question: Which tool would be best to measure the length of a butterfly?\nAnswer:metric ruler", "source": "arc_easy"}
{"text": "Question: Scientists invented a liquid that removes grease and keeps the skin soft. How could this discovery most likely be used?\nAnswer:to improve dish soap", "source": "arc_easy"}
{"text": "Question: The first step in the water cycle is evaporation. What gives water the energy to evaporate?\nAnswer:Sun", "source": "arc_easy"}
{"text": "Question: On a warm sunny afternoon, ocean water splashed onto a rock. A short time later, the rock was dry. Which statement best explains what happened to the water on the rock?\nAnswer:Heat caused the water to become a gas.", "source": "arc_easy"}
{"text": "Question: Which is a nonrenewable natural resource that is used to make electrical energy?\nAnswer:coal", "source": "arc_easy"}
{"text": "Question: Which process initiates the passage of half of a parent's DNA to offspring?\nAnswer:meiosis", "source": "arc_easy"}
{"text": "Question: Which resource provides the minerals plants need to grow?\nAnswer:soil", "source": "arc_easy"}
{"text": "Question: At what time on a sunny day will the shadow of the school's flagpole be the shortest?\nAnswer:noon", "source": "arc_easy"}
{"text": "Question: Animals get energy for growth and repair from\nAnswer:food", "source": "arc_easy"}
{"text": "Question: A flower produces seeds that fall to the ground and grow into new plants that produce more flowers. The seeds begin to grow by the process of\nAnswer:germination.", "source": "arc_easy"}
{"text": "Question: A rock has most likely traveled a long distance from its place of origin if it is\nAnswer:rounded and smooth.", "source": "arc_easy"}
{"text": "Question: Which of the following best explains why the tectonic plates of Earth move?\nAnswer:heat convection from the mantle", "source": "arc_easy"}
{"text": "Question: Over a long period of time, a rocky volcanic island that previously did not support any form of life got transformed into a dense forested region. Which of these species is most likely to have been the pioneer species that initiated this transformation?\nAnswer:lichens", "source": "arc_easy"}
{"text": "Question: The formation of coal deposits occurred over millions of years. Which feature was most responsible for these deposits?\nAnswer:swamps with dense vegetation", "source": "arc_easy"}
{"text": "Question: A teacher is performing a demonstration about static electricity for his class by rubbing a balloon against a wool sweater. The balloon sticks to the wool sweater. Which particles are exchanged during the demonstration?\nAnswer:electrons", "source": "arc_easy"}
{"text": "Question: After a race, a newspaper lists the names of the five fastest runners. Another method that could be used to identify the five fastest runners is to make a chart that shows the\nAnswer:time it took each runner to run the race.", "source": "arc_easy"}
{"text": "Question: A scientist plans to investigate the nervous system of sea slugs. What should the scientist do first?\nAnswer:Review the research other scientists have done on sea slugs.", "source": "arc_easy"}
{"text": "Question: Natural selection is a mechanism that acts on individuals within a population. Which is a result of the process of natural selection?\nAnswer:Organisms are better adapted to their environment.", "source": "arc_easy"}
{"text": "Question: What chemical symbol represents the element iron?\nAnswer:Fe", "source": "arc_easy"}
{"text": "Question: A push or a pull on an object is an example of\nAnswer:force.", "source": "arc_easy"}
{"text": "Question: Which statement is a description of weather?\nAnswer:The temperature is 55\u00b0 F in Winslow today.", "source": "arc_easy"}
{"text": "Question: Clouds and precipitation moved across western Massachusetts one evening. The temperature changed from 41\u00b0F to 28\u00b0F. Which of the following changes in precipitation most likely occurred on this evening?\nAnswer:rain changing to sleet", "source": "arc_easy"}
{"text": "Question: The human body has an average, normal temperature of about 98.6\u00baF. To keep the core body temperature from becoming too high, the brain sends a signal to the body to\nAnswer:increase blood flow to the skin.", "source": "arc_easy"}
{"text": "Question: Why is water considered to be a renewable resource?\nAnswer:Water can be used over again.", "source": "arc_easy"}
{"text": "Question: What is the most prominent land feature formed by the convergence of the Indo-Australian and Eurasian plates?\nAnswer:Himalaya Mountains", "source": "arc_easy"}
{"text": "Question: To which group does an animal belong if it lays eggs and has scales and gills?\nAnswer:fish", "source": "arc_easy"}
{"text": "Question: What causes nighttime and daytime on Earth?\nAnswer:Earth rotating on its axis", "source": "arc_easy"}
{"text": "Question: Which area is coldest?\nAnswer:tundra", "source": "arc_easy"}
{"text": "Question: Which scientist is credited with using a telescope in the seventeenth century to discover the moons of Jupiter?\nAnswer:Galileo", "source": "arc_easy"}
{"text": "Question: Which of these is a freshwater reservoir?\nAnswer:Antarctic polar ice", "source": "arc_easy"}
{"text": "Question: In eukaryotic organisms, microtubules give cells structure, and microfilaments help the cell contract and move. Together, they combine to perform functions similar to what two human body systems?\nAnswer:the skeletal and muscular systems", "source": "arc_easy"}
{"text": "Question: Which kind of rock is produced by deposition and cementation?\nAnswer:sandstone, a sedimentary rock", "source": "arc_easy"}
{"text": "Question: Which characteristic is inherited rather than learned?\nAnswer:having blue eyes", "source": "arc_easy"}
{"text": "Question: Which biological process in mammals occurs largely due to cell division?\nAnswer:healing", "source": "arc_easy"}
{"text": "Question: Frame construction predominates in the New England area due to the abundance of\nAnswer:wood.", "source": "arc_easy"}
{"text": "Question: Which of these properties of water helps moderate the weather of coastal areas?\nAnswer:high specific heat", "source": "arc_easy"}
{"text": "Question: Birds eat non-camouflaged moths at a higher rate than they eat camouflaged moths. In which situation would birds eat the moths at the slowest rate?\nAnswer:light moths in a light environment", "source": "arc_easy"}
{"text": "Question: During which process does a caterpillar become a butterfly?\nAnswer:metamorphosis", "source": "arc_easy"}
{"text": "Question: Gregor Mendel cross-pollinated red and white snapdragon flowers. What information indicates that incomplete dominance was achieved?\nAnswer:The offspring were pink.", "source": "arc_easy"}
{"text": "Question: What is the major function of the human excretory system?\nAnswer:eliminate waste materials", "source": "arc_easy"}
{"text": "Question: Yumiko gave some reasons why kettles and kitchen pans are often made of copper. Which reason is correct?\nAnswer:Copper is a good conductor of heat.", "source": "arc_easy"}
{"text": "Question: In most animals, combinations of various tissues make up functional units called\nAnswer:organs.", "source": "arc_easy"}
{"text": "Question: How do the spines of a cactus help it survive?\nAnswer:Spines protect the cactus from animals.", "source": "arc_easy"}
{"text": "Question: Water enters a plant cell through the\nAnswer:cell wall.", "source": "arc_easy"}
{"text": "Question: People are developing electric cars that would replace gasoline-burning cars. One major advantage of the electric car is that it\nAnswer:causes less pollution.", "source": "arc_easy"}
{"text": "Question: Which group of organisms would all be found living in a tropical rain forest?\nAnswer:Vines, palm trees, tree frogs, monkeys", "source": "arc_easy"}
{"text": "Question: Which SI unit would be most appropriate for recording the length of a typical classroom?\nAnswer:meter", "source": "arc_easy"}
{"text": "Question: If two objects are two meters apart, which of these changes will increase the gravitational force between the two objects?\nAnswer:moving the objects to one meter apart", "source": "arc_easy"}
{"text": "Question: Which of these cell structures converts nutrients to energy for cell functions?\nAnswer:mitochondria", "source": "arc_easy"}
{"text": "Question: Cumulonimbus clouds often form along cold fronts. Which type of weather is most likely to occur along a cold front?\nAnswer:rain with possible severe thunderstorms", "source": "arc_easy"}
{"text": "Question: An eagle is a bird that reproduces by laying its eggs in a dry nest. Which animal lays its eggs in a place most similar to the eagle?\nAnswer:reptile", "source": "arc_easy"}
{"text": "Question: The chemical formula for water is H_{2}O. What does the formula show about each element in the compound?\nAnswer:the number of atoms of each element", "source": "arc_easy"}
{"text": "Question: How far from Earth is an object that is 10 light years from Earth?\nAnswer:the distance light can travel in 10 years", "source": "arc_easy"}
{"text": "Question: The oceans most influence global climate by\nAnswer:releasing heat to the atmosphere.", "source": "arc_easy"}
{"text": "Question: A science class investigated the percentage of corn kernels that pop in bags of different brands of popcorn. Fifteen students tested three brands of popcorn each and reported their results to the class. Why did the teacher most likely have so many students report the results?\nAnswer:for more accurate results", "source": "arc_easy"}
{"text": "Question: The smallest part of an element that retains the properties of the element is the\nAnswer:atom.", "source": "arc_easy"}
{"text": "Question: What is the composition of the nucleus of an atom?\nAnswer:protons and neutrons", "source": "arc_easy"}
{"text": "Question: Which of these would best be shown as a 3-D model?\nAnswer:skeletal system", "source": "arc_easy"}
{"text": "Question: A root emerges from a seed because of the force of\nAnswer:water against the seed coat.", "source": "arc_easy"}
{"text": "Question: Which of these is the BEST reason to study weather?\nAnswer:To be prepared for storms", "source": "arc_easy"}
{"text": "Question: A recycling plant manager needs to melt 1500 kg of scrap copper to sell to a wire manufacturer. The copper is at 15\u00b0C and its melting point is 1083\u00b0C. The copper has a specific heat of 385 J/kg x K. How much heat is required to raise the temperature of the copper to its melting point?\nAnswer:6.2 x 10^8 J", "source": "arc_easy"}
{"text": "Question: A decomposer is an organism that\nAnswer:recycles nutrients", "source": "arc_easy"}
{"text": "Question: Which type of scientist would study the relationship between simple machines and energy?\nAnswer:physicist", "source": "arc_easy"}
{"text": "Question: The seeds of an oak come from the ___.\nAnswer:fruit", "source": "arc_easy"}
{"text": "Question: A manufacturer wants to produce a container for food storage that does not break easily and is airtight, inexpensive, and microwave-safe. Which of the following is the best material to use to make the container?\nAnswer:plastic", "source": "arc_easy"}
{"text": "Question: When carbon and oxygen combine chemically, the mass of the product is\nAnswer:equal to the mass of the carbon plus the mass of the oxygen", "source": "arc_easy"}
{"text": "Question: Juvenile diabetes is a disease caused by the body's inability to create insulin. The body's white blood cells attack the pancreatic cells that produce insulin. This type of disease is known as\nAnswer:an autoimmune disease.", "source": "arc_easy"}
{"text": "Question: Which of these describes a property of all matter?\nAnswer:All matter is made of atoms.", "source": "arc_easy"}
{"text": "Question: Which of the following is a characteristic of all chemical changes?\nAnswer:A new material is formed.", "source": "arc_easy"}
{"text": "Question: What is the complementary base of adenine in DNA?\nAnswer:thymine", "source": "arc_easy"}
{"text": "Question: What is the density of a 64-g iron cube that displaces 8 mL of water?\nAnswer:8 g/mL", "source": "arc_easy"}
{"text": "Question: What keeps Mars in orbit around the Sun?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: Which material is primarily a mixture of weathered rock and organic matter?\nAnswer:soil", "source": "arc_easy"}
{"text": "Question: How do plants most commonly break large rocks into smaller pieces?\nAnswer:Plant roots grow into cracks in rocks.", "source": "arc_easy"}
{"text": "Question: Which statement best describes the climate of Nevada?\nAnswer:Humidity is low throughout every summer.", "source": "arc_easy"}
{"text": "Question: What is the primary function of skin cells?\nAnswer:to provide a physical barrier to the body", "source": "arc_easy"}
{"text": "Question: Some plants grow only in specific places in the world. Some cacti, for example, grow only in deserts. Which of the following is most important in determining where a plant can grow and survive?\nAnswer:climate", "source": "arc_easy"}
{"text": "Question: A geologist found fossils of horse bones in different rock layers of a canyon. The fossils in the lower levels show shorter bones than those in the upper-level fossils. Which conclusion is based on the geologist's observations?\nAnswer:Horse's became larger over time.", "source": "arc_easy"}
{"text": "Question: Which of the following is a reason life in the outermost planets is less likely than life on planets nearer the Sun?\nAnswer:Their surfaces are extremely cold.", "source": "arc_easy"}
{"text": "Question: Which statement best explains how periods on the periodic table are organized?\nAnswer:increasing atomic number from left to right", "source": "arc_easy"}
{"text": "Question: Nonrenewable sources of energy have limited supplies. Researchers are developing devices that will make renewable energy more available. Which is a source of renewable energy?\nAnswer:wind", "source": "arc_easy"}
{"text": "Question: Which of these living things in a grassland ecosystem depend on the presence of a variety of bacteria and other microorganisms in the soil?\nAnswer:all the organisms in the ecosystem", "source": "arc_easy"}
{"text": "Question: An ecosystem is a community of organisms interacting with their physical environment. Why are decomposers an important part of ecosystems?\nAnswer:They break down dead organisms to return nutrients to the soil.", "source": "arc_easy"}
{"text": "Question: Which term identifies a group of cells that work together to perform a similar function?\nAnswer:tissue", "source": "arc_easy"}
{"text": "Question: Which of these statements is not considered part of the Big Bang Theory?\nAnswer:The universe never changes.", "source": "arc_easy"}
{"text": "Question: Cells in the body use oxygen (O2) for cellular respiration. Which is the result of cellular respiration?\nAnswer:ATP is produced and carbon dioxide (CO2) is released.", "source": "arc_easy"}
{"text": "Question: Which geologic process is absent from the Gulf Coast states?\nAnswer:subduction zones", "source": "arc_easy"}
{"text": "Question: The human body gets the energy it needs for growth and repair directly from\nAnswer:food", "source": "arc_easy"}
{"text": "Question: In what type of rock would a geologist most likely find evidence of ancient life?\nAnswer:sedimentary", "source": "arc_easy"}
{"text": "Question: During the Apollo 14 moon landing, astronauts played golf on the moon. Which of the following would be less on the moon than on Earth?\nAnswer:The weight of the golf ball", "source": "arc_easy"}
{"text": "Question: Evaporation, condensation, and precipitation are all processes which occur in the\nAnswer:water cycle.", "source": "arc_easy"}
{"text": "Question: Directions Read the information about wind erosion then answer the question. Wind can cause erosion that changes the surface of the Earth. Wind erosion can have negative effects on the environment by removing soil and polluting the air during dust storms. Walter wanted to find out if faster wind speeds increased the amount of wind erosion. Which instrument should he use to measure wind speed?\nAnswer:anemometer", "source": "arc_easy"}
{"text": "Question: Where does oxygen-rich blood go after leaving the lungs?\nAnswer:the heart.", "source": "arc_easy"}
{"text": "Question: Chemical pesticides are sometimes sprayed on crops to kill insects that eat the crops. People have different viewpoints about the use of pesticides on crops. What might be a concern about using pesticides on the crops?\nAnswer:Will the food harm humans?", "source": "arc_easy"}
{"text": "Question: The number of fish in a lake suddenly increases. How will the increase most likely affect the lake?\nAnswer:There will be fewer insects in the lake.", "source": "arc_easy"}
{"text": "Question: Which statement correctly describes a relationship between two human body systems?\nAnswer:The digestive system absorbs nutrients which are transported by the circulatory system.", "source": "arc_easy"}
{"text": "Question: Which statement best explains Earth's day and night cycle?\nAnswer:Earth rotates once each day on its axis.", "source": "arc_easy"}
{"text": "Question: What is the first thing a student should do if an accident happens during a science experiment?\nAnswer:report to the teacher", "source": "arc_easy"}
{"text": "Question: Which of the following helps keep the Moon in its orbit?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: Which process allows green plants to control the amount of water stored in their leaves?\nAnswer:transpiration", "source": "arc_easy"}
{"text": "Question: What is a job of white blood cells?\nAnswer:fight disease", "source": "arc_easy"}
{"text": "Question: Which is an example of kinetic energy?\nAnswer:a ball rolling down a hill", "source": "arc_easy"}
{"text": "Question: A new mutation that occurs in which type of cell can be passed on to offspring?\nAnswer:egg cell", "source": "arc_easy"}
{"text": "Question: When too much salt is detected in the bloodstream, the brain secretes a hormone that helps the body retain water by reducing the amount of urine produced. This is an example of\nAnswer:a feedback loop.", "source": "arc_easy"}
{"text": "Question: Which of these is a safe practice in a laboratory investigation when working with chemicals?\nAnswer:wearing safety goggles when working with chemicals", "source": "arc_easy"}
{"text": "Question: Which change in the environment would have a negative effect on the survival of a species in an ecosystem?\nAnswer:introduction of a competing species", "source": "arc_easy"}
{"text": "Question: An element is identified by\nAnswer:its number of protons.", "source": "arc_easy"}
{"text": "Question: Which of these dissolve in water?\nAnswer:Sugar cubes", "source": "arc_easy"}
{"text": "Question: What is the main function of a plant stem?\nAnswer:to carry food and water to the rest of the plant", "source": "arc_easy"}
{"text": "Question: Naturally occurring variations within a species are mainly the result of mutations and\nAnswer:sexual reproduction", "source": "arc_easy"}
{"text": "Question: As a sample of water turns to ice,\nAnswer:the arrangement of the molecules changes.", "source": "arc_easy"}
{"text": "Question: An ice cube is placed in a pan. The pan is placed over an open flame. Which change will most likely happen over time?\nAnswer:The ice changes to a liquid then to a gas.", "source": "arc_easy"}
{"text": "Question: Byron is investigating how temperature affects mold growth on bread. Before starting his procedure, Byron states in his journal that he thinks wet bread placed in the refrigerator will grow the most mold. Which term best describes Byron's statement?\nAnswer:hypothesis", "source": "arc_easy"}
{"text": "Question: The telephone was invented in Boston by\nAnswer:Alexander Graham Bell.", "source": "arc_easy"}
{"text": "Question: Which characteristic can an amoeba change that a paramecium cannot change?\nAnswer:shape", "source": "arc_easy"}
{"text": "Question: A metal spoon was left in a pot of boiling soup. The cook burned a finger by touching the spoon. Why did the finger get burned?\nAnswer:The metal spoon conducted heat to the cook's hand.", "source": "arc_easy"}
{"text": "Question: Light rays are focused by the lens of a camera through the process of\nAnswer:refraction.", "source": "arc_easy"}
{"text": "Question: Which of these provides the best evidence that the distribution of Earth's oceans has changed over time?\nAnswer:marine fossils found on land masses", "source": "arc_easy"}
{"text": "Question: Which change would have the greatest negative impact on the survival of an owl species?\nAnswer:an decrease in size of habitat", "source": "arc_easy"}
{"text": "Question: Which organ removes cell waste from the blood?\nAnswer:the kidney", "source": "arc_easy"}
{"text": "Question: According to the Big Bang Theory, how is the universe changing?\nAnswer:It is expanding.", "source": "arc_easy"}
{"text": "Question: Light enters the human eye through the\nAnswer:pupil.", "source": "arc_easy"}
{"text": "Question: The stages in the life cycle of an organism are shown below. birth -> growth -> development -> reproduction -> death In which life cycle stage will a new organism be made?\nAnswer:reproduction", "source": "arc_easy"}
{"text": "Question: Baby chicks peck their way out of their shells when they hatch. This activity is an example of which of the following types of behavior?\nAnswer:instinctive", "source": "arc_easy"}
{"text": "Question: Which conclusion can be made about earthworms because they do not have an internal skeleton?\nAnswer:They are invertebrates.", "source": "arc_easy"}
{"text": "Question: The smallest unit of a plant that can perform all of the processes of life is the\nAnswer:cell.", "source": "arc_easy"}
{"text": "Question: Soda water is a liquid that has bubbles of carbon dioxide in it. Which term best describes soda water?\nAnswer:a mixture", "source": "arc_easy"}
{"text": "Question: All stars start forming in the same manner. Some follow the life cycle of the Sun, while others turn into neutron stars or black holes. Which property determines the fate of a star as it develops?\nAnswer:mass", "source": "arc_easy"}
{"text": "Question: If a neutral atom loses an electron, what is formed?\nAnswer:An ion", "source": "arc_easy"}
{"text": "Question: A student mixed baking soda with vinegar and observed that the reaction was endothermic. When is a reaction endothermic?\nAnswer:when it requires heat to make it happen", "source": "arc_easy"}
{"text": "Question: What is the primary energy source that drives all weather events, including precipitation, hurricanes, and tornados?\nAnswer:the Sun", "source": "arc_easy"}
{"text": "Question: Which system absorbs and carries food from the digestive system to the rest of the body?\nAnswer:circulatory system", "source": "arc_easy"}
{"text": "Question: Why do planets stay in orbit around the Sun?\nAnswer:attraction of gravity", "source": "arc_easy"}
{"text": "Question: Earth rotates on its north-south axis. Which statement best describes one complete rotation?\nAnswer:It takes 24 hours and causes night and day.", "source": "arc_easy"}
{"text": "Question: A rock sample will most likely contain\nAnswer:minerals.", "source": "arc_easy"}
{"text": "Question: A jet plane is moving at a constant velocity on a flat surface. Which forces act against the forward motion of the plane?\nAnswer:friction and air resistance", "source": "arc_easy"}
{"text": "Question: Atmospheric greenhouse gases help heat the atmosphere by\nAnswer:absorbing infrared radiation released by Earth.", "source": "arc_easy"}
{"text": "Question: Scurvy is a disease that sailors often got on long voyages. It was discovered that scurvy could be prevented by eating oranges and lemons. This suggests that scurvy is a disease caused by\nAnswer:a nutritional deficiency", "source": "arc_easy"}
{"text": "Question: Runoff from farms that use fertilizers is entering a small lake. This will most directly affect the lake by causing\nAnswer:algae to grow in the lake.", "source": "arc_easy"}
{"text": "Question: Why is protein an important part of a healthy diet?\nAnswer:It is needed to repair tissue.", "source": "arc_easy"}
{"text": "Question: An atom will always have\nAnswer:equal numbers of protons and electrons.", "source": "arc_easy"}
{"text": "Question: Students on two different school campuses are comparing the growth rate of grass three weeks after fertilizer has been applied. The same fertilizer and the same amount of water are used on both campuses. Which additional variable is most important to control when the results of the two investigations are compared?\nAnswer:type of grass used", "source": "arc_easy"}
{"text": "Question: A caterpillar changing into a butterfly is an example of\nAnswer:metamorphosis.", "source": "arc_easy"}
{"text": "Question: Some immune cells are actively involved in ingesting, destroying, and presenting invading microbial antigens on their surface to stimulate other cells to produce antibodies. Which of these cells is responsible for initiating such an immune response?\nAnswer:phagocytes", "source": "arc_easy"}
{"text": "Question: A single prokaryotic cell can divide several times in an hour. Few eukaryotic cells can divide as quickly. Which of the following statements best explains this difference?\nAnswer:Eukaryotic cells are more structurally complex than prokaryotic cells.", "source": "arc_easy"}
{"text": "Question: Which biological process determines the probability that particular alleles will be found in any given gamete?\nAnswer:meiosis", "source": "arc_easy"}
{"text": "Question: When a person speaks into a telephone, sound energy is changed mostly into which form of energy?\nAnswer:electrical", "source": "arc_easy"}
{"text": "Question: In the human body, what part of the central nervous system connects with other nerves outside of the central nervous system?\nAnswer:spinal cord", "source": "arc_easy"}
{"text": "Question: Photovoltaic cells capture photons of sunlight and transform them directly into electricity. Many of Earth's other energy resources are simply transformed solar energy. Which two energy resources store energy that did not begin as solar energy?\nAnswer:nuclear and geothermal", "source": "arc_easy"}
{"text": "Question: What determines how long the Moon takes to complete one cycle of phases?\nAnswer:the period of revolution of the Moon around Earth", "source": "arc_easy"}
{"text": "Question: Oxygen reacts with iron to produce rust and with hydrogen to produce water. Which statement describes both reactions?\nAnswer:New molecules are formed but the same elements exist.", "source": "arc_easy"}
{"text": "Question: What is the primary job of red blood cells?\nAnswer:transport oxygen", "source": "arc_easy"}
{"text": "Question: What kingdom contains organisms that are multicellular, have no chlorophyll, and absorb nutrients from decaying tissue?\nAnswer:Fungi", "source": "arc_easy"}
{"text": "Question: A salvage yard contains a mixture of iron, glass, aluminum, and plastic. Which property of iron does the salvage yard take advantage of when separating the iron from the rest of the materials?\nAnswer:magnetic", "source": "arc_easy"}
{"text": "Question: While a sailor was out fishing, he got lost at sea. Which object would help him direct the boat back to shore?\nAnswer:Magnetic compass", "source": "arc_easy"}
{"text": "Question: Water is a very important part of the physical weathering of rock. Which of these properties of water is most important in causing some of the physical weathering of rock?\nAnswer:Water expands when it freezes.", "source": "arc_easy"}
{"text": "Question: A student uses a telescope to view stars at night. The student notices some of the stars are different colors. The color of a star is determined most by its\nAnswer:temperature.", "source": "arc_easy"}
{"text": "Question: Which function is performed at similarly structured sites in prokaryotic and eukaryotic cells?\nAnswer:protein synthesis", "source": "arc_easy"}
{"text": "Question: Which material is the best natural resource to use for making water-resistant shoes?\nAnswer:leather", "source": "arc_easy"}
{"text": "Question: When hunting by humans causes a species to become extinct, this may produce damaging effects throughout the ecosystem of the extinct species. What is the cause of this damage?\nAnswer:alteration of a food web", "source": "arc_easy"}
{"text": "Question: Sarah's class is learning about mixtures and solutions. Her teacher writes four statements on the board. Which statement best describes a mixture?\nAnswer:One substance can be separated from the other.", "source": "arc_easy"}
{"text": "Question: Which of the following best explains why the Sun appears to move across the sky every day?\nAnswer:Earth rotates on its axis.", "source": "arc_easy"}
{"text": "Question: The theory of spontaneous generation was eventually disproved scientifically by\nAnswer:conducting a controlled experiment.", "source": "arc_easy"}
{"text": "Question: Discarded electronic devices, such as outdated computers and cell phones, contain materials that can be toxic to the environment. Which statement best explains why humans continue to use these technologies?\nAnswer:Humans value the benefits of these devices over their cost.", "source": "arc_easy"}
{"text": "Question: A student crumples up a sheet of paper. Which property of the paper has changed?\nAnswer:shape", "source": "arc_easy"}
{"text": "Question: When a plant dies, it often decomposes and becomes part of the soil. This process is one step in which cycle?\nAnswer:carbon", "source": "arc_easy"}
{"text": "Question: Which would best aid a scientist in discovering how Earth may have changed over time?\nAnswer:discovering a fossil of a seashell in a wooded area", "source": "arc_easy"}
{"text": "Question: Kendall studied the ways in which human body systems work together. He compared the respiratory and circulatory systems. In which way are these two systems similar to each other?\nAnswer:They both bring oxygen to the body.", "source": "arc_easy"}
{"text": "Question: A difference between the oceanic crust and the continental crust is that the oceanic crust is\nAnswer:more dense than the continental crust.", "source": "arc_easy"}
{"text": "Question: Which of these elements is found in the greatest amount in organisms?\nAnswer:carbon", "source": "arc_easy"}
{"text": "Question: After mining removes layers of rock from a hillside, new plants begin to grow in the cracks of the bare rock. The plants beginning to grow are an example of which natural process?\nAnswer:primary succession in a new habitat", "source": "arc_easy"}
{"text": "Question: Improvements in farming technology would most likely\nAnswer:increase the amount of food produced.", "source": "arc_easy"}
{"text": "Question: In a container, a mixture of water and salt is stirred so that the salt dissolves completely. Sand is added to this solution and allowed to settle to the bottom of the container. If the container is placed on a heat source and the liquid evaporates completely, what will be left in the container?\nAnswer:Salt and sand will both remain in the container.", "source": "arc_easy"}
{"text": "Question: Which of the following is formed immediately after fertilization?\nAnswer:zygote", "source": "arc_easy"}
{"text": "Question: Which of the following helped lead to the invention of personal computers?\nAnswer:integrated circuit", "source": "arc_easy"}
{"text": "Question: Blood absorbs oxygen in the\nAnswer:lungs.", "source": "arc_easy"}
{"text": "Question: A student adds sugar, spices, and salt to a bowl of peanuts and stirs them together. What has the student made?\nAnswer:a mixture", "source": "arc_easy"}
{"text": "Question: Over time, non-volcanic mountains can form due to the interaction of plate boundaries. Which interaction is most likely associated with the formation of non-volcanic mountains?\nAnswer:continental plates colliding with continental plates", "source": "arc_easy"}
{"text": "Question: Most stars in the Milky Way are like the Sun. The Sun will eventually become a red giant. After the red giant stage, what determines whether a star will become a white dwarf or a supernova?\nAnswer:the mass of the star", "source": "arc_easy"}
{"text": "Question: How should researchers share their findings with other scientists to validate their study of the effectiveness of a new medication?\nAnswer:publish the research results in a scientific journal", "source": "arc_easy"}
{"text": "Question: Gaseous sulfur dioxide is a compound that combines with water in the atmosphere to form acid rain. What is the primary source of sulfur dioxide?\nAnswer:combustion of fossil fuels", "source": "arc_easy"}
{"text": "Question: The motion of Earth is responsible for several celestial events. Which of the following events is caused by Earth revolving around the sun?\nAnswer:the days in a year", "source": "arc_easy"}
{"text": "Question: What takes place as a light wave enters a denser medium?\nAnswer:it is refracted", "source": "arc_easy"}
{"text": "Question: Deforestation in the rainforest can lead to localized extinctions of populations of some organisms. Once an area is deforested, which is most likely to decrease and result in organisms' extinctions?\nAnswer:diversity of the resources in the habitat", "source": "arc_easy"}
{"text": "Question: Which of the following causes a ship\u2019s iron anchor to sink to the ocean floor when it is released overboard?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: In clear weather, a bright light can be seen for a long distance. In conditions of heavy fog, the visibility is greatly reduced. Which of the following explains the reduced visibility?\nAnswer:Light is scattered by water droplets in the air.", "source": "arc_easy"}
{"text": "Question: When the pesticide DDT was first used, it killed nearly every mosquito it touched. Within a few years, however, many mosquitoes became resistant to DDT and survived. What enabled this to happen?\nAnswer:gene mutations", "source": "arc_easy"}
{"text": "Question: When air is heated, it will most likely\nAnswer:expand and rise.", "source": "arc_easy"}
{"text": "Question: The wheels and gears of a machine are greased in order to decrease\nAnswer:friction", "source": "arc_easy"}
{"text": "Question: A student learns that one year on Mercury is about 88 Earth days. This means it takes 88 Earth days for Mercury to\nAnswer:make one complete orbit around the Sun.", "source": "arc_easy"}
{"text": "Question: Two processes are involved in the formation of a sand dune. Which two processes best describe how a sand dune forms?\nAnswer:wind erosion then deposition", "source": "arc_easy"}
{"text": "Question: When a student uses the equation, mass multiplied by change in temperature multiplied by specific heat, what is being calculated? q = m \\times C \\times \\Delta T\nAnswer:heat gain or heat loss", "source": "arc_easy"}
{"text": "Question: Which rock is most likely to contain fossil seashells?\nAnswer:limestone", "source": "arc_easy"}
{"text": "Question: Which occurs as a result of Earth's tilt on its rotating axis?\nAnswer:seasonal changes in the climate", "source": "arc_easy"}
{"text": "Question: Planets remain in orbit around the Sun because of\nAnswer:gravity.", "source": "arc_easy"}
{"text": "Question: Which cells help to destroy pathogens such as bacteria that enter the human body?\nAnswer:white blood cells", "source": "arc_easy"}
{"text": "Question: Eye color in human beings is an\nAnswer:inherited trait.", "source": "arc_easy"}
{"text": "Question: If a species is no longer able to reproduce, it will\nAnswer:become extinct", "source": "arc_easy"}
{"text": "Question: Which of these is hottest?\nAnswer:The Sun", "source": "arc_easy"}
{"text": "Question: In large industrial cities, the emissions from fossil fuels cause the atmosphere to change. Which process allows the atmosphere to change?\nAnswer:increased buildup of greenhouse gases", "source": "arc_easy"}
{"text": "Question: Which is the most likely response of a human to an increase in temperature?\nAnswer:increasing the amount of perspiration", "source": "arc_easy"}
{"text": "Question: An organism's traits are largely determined by the genetic makeup of its parents. A mutation in which kinds of cells in a parent could cause a new trait to appear in the parent's offspring?\nAnswer:sperm or egg", "source": "arc_easy"}
{"text": "Question: Electricity to play your radio can be made using renewable or nonrenewable resources. Which of the following resources are renewable?\nAnswer:wind and sunlight", "source": "arc_easy"}
{"text": "Question: The action of turning off the water while brushing teeth is an example of\nAnswer:conservation.", "source": "arc_easy"}
{"text": "Question: Which objects are the most useful for collecting data on the speed of a toy car?\nAnswer:stopwatch, calculator, meter stick", "source": "arc_easy"}
{"text": "Question: Some microorganisms cause human disease. Other microorganisms are used in making cheese, yogurt, and bread. Based on this information, the relationship between humans and microorganisms can be\nAnswer:beneficial or harmful", "source": "arc_easy"}
{"text": "Question: Which of these objects is visible because it reflects light toward the eye?\nAnswer:shiny metallic balloon", "source": "arc_easy"}
{"text": "Question: Which dog trait is a learned behavior?\nAnswer:jumping to catch a ball", "source": "arc_easy"}
{"text": "Question: When an atom has a neutral charge, which particles within the atom have equal numbers?\nAnswer:protons and electrons", "source": "arc_easy"}
{"text": "Question: A paper bag is ripped into pieces. Which of these BEST describes the pieces of the bag?\nAnswer:Smaller than the whole bag", "source": "arc_easy"}
{"text": "Question: A lizard most likely would be protected from its enemies if it has which characteristic?\nAnswer:skin color that matches its habitat", "source": "arc_easy"}
{"text": "Question: Copper is used in house wiring because it is\nAnswer:an electrical conductor.", "source": "arc_easy"}
{"text": "Question: Which process causes light to bend and form a rainbow?\nAnswer:refraction", "source": "arc_easy"}
{"text": "Question: Sugar is composed of carbon, hydrogen, and oxygen. Sugar is an example of which of the following?\nAnswer:a compound", "source": "arc_easy"}
{"text": "Question: The tendency of a stationary object to resist being put into motion is known as\nAnswer:inertia.", "source": "arc_easy"}
{"text": "Question: One way that students can help conserve natural resources at school is by\nAnswer:recycling aluminum cans.", "source": "arc_easy"}
{"text": "Question: The Grand Canyon is an example of\nAnswer:erosion.", "source": "arc_easy"}
{"text": "Question: Humans cannot survive without clean, fresh water. Reservoirs of liquid water vary, but all water spends time as a gas in the atmosphere. What is the source of most of the water in the atmosphere?\nAnswer:oceans", "source": "arc_easy"}
{"text": "Question: When a frying pan is placed on an electric stove top, heat energy is transferred from the burner to the pan by\nAnswer:conduction.", "source": "arc_easy"}
{"text": "Question: What happens when water flows over a rock for a long period of time?\nAnswer:erosion", "source": "arc_easy"}
{"text": "Question: During winter, the white fur of an arctic fox blends in with the snow. This adaptation is called\nAnswer:camouflage", "source": "arc_easy"}
{"text": "Question: How has the invention of the personal computer helped people the most?\nAnswer:by increasing communication", "source": "arc_easy"}
{"text": "Question: Humans depend on which natural resource from the environment?\nAnswer:water", "source": "arc_easy"}
{"text": "Question: The danger posed to fish in an aquarium by an overpopulation of bacteria caused by an algal bloom is most likely a\nAnswer:reduction in oxygen levels.", "source": "arc_easy"}
{"text": "Question: Natural processes shape the surface of Earth. Most canyons are formed by ___.\nAnswer:moving water", "source": "arc_easy"}
{"text": "Question: What is the best way for a student to describe the results of an experiment?\nAnswer:in a written report", "source": "arc_easy"}
{"text": "Question: Which of the following is a living component of a desert in California?\nAnswer:horned lizard", "source": "arc_easy"}
{"text": "Question: Scientists wonder how the Egyptian pyramids were built. They think that the huge blocks of stone may have been put into place by pushing them up a sloping pathway. The pathway is which type of simple machine?\nAnswer:inclined plane", "source": "arc_easy"}
{"text": "Question: Magnesium strips are long, thin strips that are gray and shiny. Which action will lead to a chemical change of magnesium strips?\nAnswer:burning them with a candle", "source": "arc_easy"}
{"text": "Question: Which involves the greatest variety of cell types?\nAnswer:an organism", "source": "arc_easy"}
{"text": "Question: Snapping a rubber band most likely produces which type of energy?\nAnswer:sound", "source": "arc_easy"}
{"text": "Question: People can help keep a forest a good place for birds to live by\nAnswer:preventing too many trees from being cut down", "source": "arc_easy"}
{"text": "Question: Randall is picking lettuce from his garden for dinner. His mother told him to leave some leaves on each plant. Why is it important to leave some leaves on the plant?\nAnswer:Leaves help the plant make food.", "source": "arc_easy"}
{"text": "Question: A negatively-charged ion has\nAnswer:more electrons than protons.", "source": "arc_easy"}
{"text": "Question: Which statement explains what will most likely happen to the hydrosphere in an area where air temperatures increase?\nAnswer:Evaporation will increase.", "source": "arc_easy"}
{"text": "Question: Which energy source is considered nonrenewable?\nAnswer:oil", "source": "arc_easy"}
{"text": "Question: When buried sediments are subjected to pressure, the mineral grains are squeezed together. What is the result of this action?\nAnswer:new rock is formed", "source": "arc_easy"}
{"text": "Question: What is the primary source of energy for organisms from a beach ecosystem?\nAnswer:the Sun", "source": "arc_easy"}
{"text": "Question: Before rock can become soil, it must undergo certain processes. One process in the formation of soil involves plants. How can plants chemically change rocks into soil?\nAnswer:They weather rocks with acid.", "source": "arc_easy"}
{"text": "Question: Which is the best way a science student can help to maintain laboratory equipment?\nAnswer:clean up all materials and workspaces after investigations", "source": "arc_easy"}
{"text": "Question: Which of the following statements best explains why stars appear to move across Earth's sky each night?\nAnswer:Earth rotates on its axis.", "source": "arc_easy"}
{"text": "Question: Researchers are developing new types of crop plants with desirable characteristics such as disease resistance and drought tolerance. Crossing plants so that the next generation will express desirable traits is best described as\nAnswer:selective breeding.", "source": "arc_easy"}
{"text": "Question: In May 2007, wildfires burned more than 350 square miles of habitat in Florida and Georgia. Intense fires like this one can temporarily remove nitrogen, phosphorus, and potassium in area soil. What most likely happens in the burned areas until organic decay replenishes the lost nutrients?\nAnswer:The carrying capacity of the soil for plant growth is reduced.", "source": "arc_easy"}
{"text": "Question: Helen is preparing a presentation about objects in the solar system. She includes facts about the order of the planets and their distances from the Sun. Which statement could she include in an accurate presentation?\nAnswer:Earth is one astronomical unit from the Sun.", "source": "arc_easy"}
{"text": "Question: Farmers in the 1800s used axes to clear trees from farmland. Now, farmers use chainsaws to clear the trees. How do chainsaws most likely help farmers?\nAnswer:Farmers can remove more trees in less time.", "source": "arc_easy"}
{"text": "Question: What can a moving magnet in a coil of copper wire cause?\nAnswer:an electric current", "source": "arc_easy"}
{"text": "Question: A researcher determines a cell has a flexible cell wall composed of peptidoglycan. This observation narrows possible classifications of the cell to which taxonomic group?\nAnswer:bacteria", "source": "arc_easy"}
{"text": "Question: A student conducts an investigation using mold spores. In one part of the investigation, he needs to closely examine a spore sample. Which piece of equipment does the student need to use to keep mold spores from entering his respiratory system?\nAnswer:breathing mask", "source": "arc_easy"}
{"text": "Question: Vultures are scavengers that most likely help ecosystems by quickly consuming dead organisms and\nAnswer:slowing the spread of disease.", "source": "arc_easy"}
{"text": "Question: What is the process called when an acid and a base combine to produce water and salt?\nAnswer:neutralization", "source": "arc_easy"}
{"text": "Question: Amylase is a chemical that decomposes starch into maltose and dextrin. Which best describes the role of amylase in the human body?\nAnswer:as an enzyme that aids in digestion", "source": "arc_easy"}
{"text": "Question: Sound waves can pass through all of these except\nAnswer:a vacuum.", "source": "arc_easy"}
{"text": "Question: Why is it important to repeat an experiment several times?\nAnswer:to determine if the results are similar", "source": "arc_easy"}
{"text": "Question: Which force causes a marble to sink to the bottom of a glass of water?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: A mosquito is a type of flying insect that lays eggs in puddles or small pools of water. When larvae develop from eggs, the larvae come to the surface to get air through special breathing tubes. After one to two weeks, the larvae become pupae and then turn into adults. How would a dry summer affect a mosquito population?\nAnswer:The adult mosquitoes would have fewer places to lay eggs.", "source": "arc_easy"}
{"text": "Question: NASA's Kepler Mission has collected information about main-sequence stars with characteristics similar to the Sun. What is the most common color of these stars?\nAnswer:yellow", "source": "arc_easy"}
{"text": "Question: A fever is a response to a disease-causing agent infecting the body. Raising one's body temperature changes the shape of enzymes in the agent so it cannot reproduce. Which statement best describes a fever?\nAnswer:A fever is an internal response to an internal stimulus.", "source": "arc_easy"}
{"text": "Question: Two people are pushing a car. One person is pushing with a force of 450 N and the other person is pushing with a force of 300 N. What information is needed to determine the net force applied to the car by the people?\nAnswer:the direction of the forces", "source": "arc_easy"}
{"text": "Question: A student proposes the rate of increase in a plant's mass will be proportional to the length of light exposure per day when all other variables are constant. How should this proposal be classified?\nAnswer:as a hypothesis", "source": "arc_easy"}
{"text": "Question: Approximately how many times will Earth rotate during one revolution around the Sun?\nAnswer:365", "source": "arc_easy"}
{"text": "Question: A shiny aluminum screen can be placed on the windshield of a parked car. This screen helps to keep the car cool because it\nAnswer:reflects the sunlight", "source": "arc_easy"}
{"text": "Question: Which property of an object can be described as smooth?\nAnswer:texture", "source": "arc_easy"}
{"text": "Question: During photosynthesis, plants absorb light energy from the Sun and convert it into chemical energy in the form of glucose. Which compounds combine in the presence of sunlight to form glucose?\nAnswer:carbon dioxide (CO2) and water (H2O)", "source": "arc_easy"}
{"text": "Question: A researcher is viewing a cell that has cell walls. To best narrow down the taxonomic group from which the cell belongs, which question should a researcher ask?\nAnswer:What is the composition of the cell walls?", "source": "arc_easy"}
{"text": "Question: Which of the following best explains what will occur when a population grows larger than the carrying capacity of its environment?\nAnswer:The death rate will increase.", "source": "arc_easy"}
{"text": "Question: Oceans have many layers of sediments. These layers become compacted when they are buried under other layers of sediments. Which is most likely to happen to the deepest layers?\nAnswer:They will recrystallize into new rock.", "source": "arc_easy"}
{"text": "Question: The first microscopes were built in the 1600s. Microscopes have improved since then, but still perform the same job. How do microscopes most help scientists?\nAnswer:They make small objects easier to see.", "source": "arc_easy"}
{"text": "Question: What do plants take from the air that helps them make food?\nAnswer:carbon dioxide", "source": "arc_easy"}
{"text": "Question: When a person sees something, what carries the message from the eyes to the brain?\nAnswer:nerves", "source": "arc_easy"}
{"text": "Question: Which of the following is an abiotic factor that can influence the quantity of fish a pond can support?\nAnswer:quality of water", "source": "arc_easy"}
{"text": "Question: The islands in the mid-Pacific Ocean region were formed by\nAnswer:volcanic activity.", "source": "arc_easy"}
{"text": "Question: Which term identifies a single unit of hereditary information?\nAnswer:gene", "source": "arc_easy"}
{"text": "Question: A mother hen clucks loudly when danger is near and her chicks quickly gather around her. Which sense helps the chicks receive this warning about danger from their mother?\nAnswer:sound", "source": "arc_easy"}
{"text": "Question: Newly hatched turtles are easy prey for other animals. What is an important ability turtles have for better survival of their offspring?\nAnswer:to lay hundreds of eggs so a few will survive", "source": "arc_easy"}
{"text": "Question: Mr. Mendoza's class studied different body systems. What is an important function of the circulatory system?\nAnswer:carrying oxygen to cells", "source": "arc_easy"}
{"text": "Question: Which example shows a new substance being formed?\nAnswer:a candle burning", "source": "arc_easy"}
{"text": "Question: What do all mammals have in common that distinguishes them from birds?\nAnswer:fur", "source": "arc_easy"}
{"text": "Question: Grooves running down the sides of a riverbank are most likely caused by\nAnswer:rainwater.", "source": "arc_easy"}
{"text": "Question: Which of the following best describes a mineral?\nAnswer:a solid natural material with a crystal structure", "source": "arc_easy"}
{"text": "Question: Plankton are tiny ocean organisms. The role of one type of plankton is to use the energy from the Sun to produce food that other animals eat. Which organism has the same role in the ocean as this type of plankton?\nAnswer:seaweed", "source": "arc_easy"}
{"text": "Question: How many times does the Moon rotate on its axis during a lunar month?\nAnswer:one", "source": "arc_easy"}
{"text": "Question: Changes to abiotic factors in an environment can impact biotic factors. Which statement is the BEST example of this situation?\nAnswer:Drought conditions increase competition among consumers.", "source": "arc_easy"}
{"text": "Question: There are several different types of rock. Each type of rock is formed under different conditions. How are sedimentary rocks, such as shale and sandstone, formed?\nAnswer:Particles are compressed into layers.", "source": "arc_easy"}
{"text": "Question: Which disease is correctly paired with the cause of the disease?\nAnswer:athlete's foot - fungi", "source": "arc_easy"}
{"text": "Question: Unequal distribution of the hormone auxin in plants helps to regulate the direction of plant growth. Which of the following is accomplished by plants in regulating the distribution of auxin?\nAnswer:responding to the environment", "source": "arc_easy"}
{"text": "Question: Ten people became sick with the flu after attending a school dance. What is the scenario that could best explain how the people got sick?\nAnswer:contact with an infected person", "source": "arc_easy"}
{"text": "Question: One way to protect against food poisoning is to\nAnswer:cook food to proper temperatures.", "source": "arc_easy"}
{"text": "Question: Which statement is a MAJOR mistake in the experimental design?\nAnswer:A control group was not used.", "source": "arc_easy"}
{"text": "Question: Which effect do rapidly cooling temperatures have on the water cycle?\nAnswer:Water vapor condenses into droplets.", "source": "arc_easy"}
{"text": "Question: A researcher found shark fossils on top of a mountain. This evidence suggests which of the following about this region?\nAnswer:It was once covered by an ocean.", "source": "arc_easy"}
{"text": "Question: A student is measuring the distance a car travels down a ramp using yards. Which measurement is most similar in length when using the metric system of measurement?\nAnswer:meter", "source": "arc_easy"}
{"text": "Question: A marble is dropped in a glass of water. Which force pulls the marble to the bottom of the glass?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: Which scientist formulated rules that describe the observable relationships of plant traits to the traits of the ancestor plants?\nAnswer:Gregor Mendel", "source": "arc_easy"}
{"text": "Question: The invention of the telescope allowed which of the following to take place?\nAnswer:detailed observation of planets", "source": "arc_easy"}
{"text": "Question: Which instrument should a student use to measure exactly 10 milliliters (mL) of water?\nAnswer:graduated cylinder", "source": "arc_easy"}
{"text": "Question: A gas is heated and its temperature increases. What happens to the gas molecules?\nAnswer:They move faster.", "source": "arc_easy"}
{"text": "Question: Which tool is used to measure the diameter of a dime?\nAnswer:ruler", "source": "arc_easy"}
{"text": "Question: A rainforest area is experiencing a severe drought. As a consequence, the insect population has decreased. What will the insect-eating birds most likely do as a result of the drought?\nAnswer:move to a new area to find food", "source": "arc_easy"}
{"text": "Question: Which unit is used to indicate the amount of energy in food?\nAnswer:calorie", "source": "arc_easy"}
{"text": "Question: Wire was looped several times around an iron nail, and the wire's ends were connected to a battery. For which of these will this device most likely be used?\nAnswer:to create a magnetic field", "source": "arc_easy"}
{"text": "Question: Dust and ash entering the atmosphere as a result of volcanic eruptions can affect Earth's\nAnswer:weather and climate", "source": "arc_easy"}
{"text": "Question: During which chemical process is energy absorbed?\nAnswer:plants photosynthesizing", "source": "arc_easy"}
{"text": "Question: When two nuclei are combined into one nucleus, there is a slight change in mass and the release of a large amount of energy. What is this process called?\nAnswer:fusion", "source": "arc_easy"}
{"text": "Question: The sound, light, and heat that a firecracker produces are originally stored as which type of energy?\nAnswer:chemical energy", "source": "arc_easy"}
{"text": "Question: Vehicle exhaust contains a form of pollution called particulate matter. Technologies are being developed to reduce the amount of particulate matter in exhaust. A vehicle that produces less particulate matter would have the greatest impact on which aspect of human health?\nAnswer:respiratory health", "source": "arc_easy"}
{"text": "Question: Janet learns that Earth is tilted. Due to its tilt, some areas on the surface of Earth experience darkness for an entire day. Which plant process is affected most during this darkness?\nAnswer:photosynthesis", "source": "arc_easy"}
{"text": "Question: What types of cells are found only in organisms that reproduce sexually?\nAnswer:gametes", "source": "arc_easy"}
{"text": "Question: Several dinosaur bones are discovered buried in volcanic ash. The type of dinosaur can best be identified by\nAnswer:comparing to characteristics of known dinosaurs.", "source": "arc_easy"}
{"text": "Question: Stretching is considered an important step before engaging in sports. In an investigation to see whether stretching before physical exertion reduces sports injuries, who would the control group most likely be?\nAnswer:athletes who do not stretch before working out", "source": "arc_easy"}
{"text": "Question: In the first half of this century, which technology allowed people, for the first time, to work IN the city but live OUTSIDE the city?\nAnswer:automobiles", "source": "arc_easy"}
{"text": "Question: Most sedimentary rock is made from sediments of other rock. Which of these processes would the sediments most likely go through to form sedimentary rock?\nAnswer:compaction and cementation", "source": "arc_easy"}
{"text": "Question: Rocks and Earth and on the Moon are made of similar materials. What does this observation most likely suggest?\nAnswer:The Moon was probably formed from material from Earth.", "source": "arc_easy"}
{"text": "Question: In any ecosystem, organisms interact with biotic and abiotic parts of the environment. As a result of all of the interactions, the matter within the system is\nAnswer:recycled when organisms die.", "source": "arc_easy"}
{"text": "Question: Data indicate that chemical pollutants contaminate 53% of the waterways that empty into the Chesapeake Bay. These chemical pollutants are found in the tissues of animals living in the bay. Which group of people who live away from the bay might be most affected by these chemical pollutants?\nAnswer:people who consume fish from the bay", "source": "arc_easy"}
{"text": "Question: Which behavior can help animals establish a territory?\nAnswer:A wolf pack howls to warn other wolves to stay away.", "source": "arc_easy"}
{"text": "Question: Arteries and veins are two important parts of the circulatory system. What is the relationship between arteries and veins?\nAnswer:They work together to transport nutrients.", "source": "arc_easy"}
{"text": "Question: Which function is a role of a feedback system?\nAnswer:regulation of growth in the skeletal system", "source": "arc_easy"}
{"text": "Question: Which technique will researchers studying the inheritance patterns of various disorders most likely use?\nAnswer:chromosomal analysis", "source": "arc_easy"}
{"text": "Question: If a lake is polluted, which organism would most likely accumulate the highest concentration of contaminants?\nAnswer:fish-eating birds", "source": "arc_easy"}
{"text": "Question: Which of these can only be found in a plant cell?\nAnswer:a chloroplast", "source": "arc_easy"}
{"text": "Question: The Milky Way Galaxy is visible as a bright region in the night sky. Modern telescopic observation has made it possible to discover that the brightness of the Milky Way Galaxy is due primarily to which structure?\nAnswer:large numbers of stars", "source": "arc_easy"}
{"text": "Question: More sulfur dioxide is being added to the atmosphere. How will this most likely affect the hydrosphere?\nAnswer:The acidity of the ocean will increase.", "source": "arc_easy"}
{"text": "Question: Plants transform energy when they make their own food. Which type of energy is used by plants for making food?\nAnswer:light", "source": "arc_easy"}
{"text": "Question: Dominic placed a caterpillar in a container with different kinds of leaves. Which information should he record to find out what food this caterpillar eats?\nAnswer:the type of leaves the caterpillar has eaten", "source": "arc_easy"}
{"text": "Question: Which class of elements best conducts electricity?\nAnswer:metals", "source": "arc_easy"}
{"text": "Question: What are the products in the chemical reaction below? NaOH + HCl -> NaCl + H_{2}O\nAnswer:sodium chloride and water", "source": "arc_easy"}
{"text": "Question: Termites eat wood but cannot digest it. Protozoans live in the termites' stomachs and use enzymes to break down the wood. The digested wood provides nutrition for both the termites and the protozoans. What type of relationship is this?\nAnswer:mutualism", "source": "arc_easy"}
{"text": "Question: In the Adirondack forests of New York, some trees have died. The change in the forest is thought to be related to air pollution and rain. Which abiotic factor most likely has been changed as a result of the pollution and rain which resulted in the death of the trees?\nAnswer:a decrease in the pH of the soil", "source": "arc_easy"}
{"text": "Question: The first step in the construction of a building typically involves\nAnswer:clearing the land.", "source": "arc_easy"}
{"text": "Question: What biological concept was Mendel studying when he crossed pea plants many times over many generations?\nAnswer:dominant and recessive traits", "source": "arc_easy"}
{"text": "Question: The following represents a number displayed on a calculator. 1.454545 E3. Which of the following shows how a student should record this number in a laboratory report?\nAnswer:1.45 x 10^3", "source": "arc_easy"}
{"text": "Question: In which process is nitrogen from the air put into a form that plants can use?\nAnswer:nitrogen fixation", "source": "arc_easy"}
{"text": "Question: The surface of the Moon is covered with craters. Most of these craters were formed by\nAnswer:the impacts of many meteoroids", "source": "arc_easy"}
{"text": "Question: Which event would most likely occur if the number of nitrogen fixing bacteria were reduced within an ecosystem?\nAnswer:the level of nitrogen gas in the atmosphere would increase", "source": "arc_easy"}
{"text": "Question: Census data show that the human population doubled from 2.65 billion in 1953 to 5.3 billion in 1990. If it continues to double at this rate, the human population could reach 10 billion by the year 2020. Which best explains how this rate of human growth can harm the environment on which humans depend?\nAnswer:by using resources faster than they can be replaced", "source": "arc_easy"}
{"text": "Question: Bats find their prey at night using one of their senses to detect echoes. What does the bat send out to find prey?\nAnswer:sound", "source": "arc_easy"}
{"text": "Question: Which two objects produce their own light?\nAnswer:sun and candle", "source": "arc_easy"}
{"text": "Question: Which example describes an organism taking in nutrients?\nAnswer:a girl eating an apple", "source": "arc_easy"}
{"text": "Question: In eukaryotic organisms, interaction between which organelles is most important for cell shape, tensile strength, and communication between cells?\nAnswer:cytoskeleton and cell membrane", "source": "arc_easy"}
{"text": "Question: A radio station broadcasting across a large area is experiencing thunderstorms. How will the radio waves from the station be affected?\nAnswer:frequency will be distorted", "source": "arc_easy"}
{"text": "Question: An electrical circuit can be used to break down water into hydrogen and oxygen. In this process, electrical energy produces\nAnswer:chemical changes.", "source": "arc_easy"}
{"text": "Question: Which method could be used to separate a solution of table salt and water?\nAnswer:evaporation", "source": "arc_easy"}
{"text": "Question: Which is an example of light being reflected?\nAnswer:looking into a mirror", "source": "arc_easy"}
{"text": "Question: What is the MAJOR role of the Sun in the water cycle?\nAnswer:It causes evaporation.", "source": "arc_easy"}
{"text": "Question: Which activity is an example of a chemical change?\nAnswer:burning wood to produce ashes", "source": "arc_easy"}
{"text": "Question: A city has a temperature of 75 \u00b0F, with partly cloudy skies. Weather forecasters are predicting that the air pressure and temperature will drop during the day. Which type of weather is most likely for this area in the late afternoon?\nAnswer:rainy.", "source": "arc_easy"}
{"text": "Question: In Maryland, most bears have thick, dark fur. Which statement best explains how dark fur helps bears survive in the forests of Maryland?\nAnswer:Dark fur helps bears hide.", "source": "arc_easy"}
{"text": "Question: Nicole was studying different ecosystems. She compared the number of plants living in a forest to those in a desert. Which factor best explains why more plants may survive in a forest?\nAnswer:There is more rain in the forest.", "source": "arc_easy"}
{"text": "Question: A short plant with a thick, fleshy stem, extensive roots, and a short blooming period would most likely be found in which of the following environments?\nAnswer:desert", "source": "arc_easy"}
{"text": "Question: What happens when oil is placed in water?\nAnswer:The oil floats on top of the water.", "source": "arc_easy"}
{"text": "Question: A decomposer is an organism that\nAnswer:breaks down dead plants and animals", "source": "arc_easy"}
{"text": "Question: Which of the following correctly orders part of a fish's respiratory system from the least complex to most complex?\nAnswer:cells -> tissues -> gills", "source": "arc_easy"}
{"text": "Question: Most birds sit on their eggs until they hatch. Which of these is the most important reason why birds sit on their eggs?\nAnswer:to keep the eggs warm", "source": "arc_easy"}
{"text": "Question: A lab technician places a colony of bacterial cells in a nutrient-rich growth medium. Which event is the technician most likely to observe with a microscope?\nAnswer:cell division", "source": "arc_easy"}
{"text": "Question: When sound waves with large amplitude are compared to sound waves with small amplitude, which of the following is true?\nAnswer:Sound waves with large amplitudes have more energy and sound louder.", "source": "arc_easy"}
{"text": "Question: Vinegar and water are placed in a container and stirred. What is formed when they are mixed?\nAnswer:solution", "source": "arc_easy"}
{"text": "Question: Which of the following best describes the climate of an area?\nAnswer:the average temperature and total precipitation each month for ten years", "source": "arc_easy"}
{"text": "Question: Salt and pepper are placed together in a container. When the container is shaken, the salt and pepper become a\nAnswer:mixture.", "source": "arc_easy"}
{"text": "Question: All natural resources on Earth are either renewable or nonrenewable. Whether a resource is renewable or nonrenewable depends on how fast or slow the resource is replaced. If the resource is used faster than it is replaced, then the resource will, in time, disappear. Which statement describes the use of a renewable natural resource?\nAnswer:A farmer plants different types of crops to protect the soil.", "source": "arc_easy"}
{"text": "Question: Which of the following statements best explains why earthquakes occur more frequently in California than in Massachusetts?\nAnswer:California is located on the boundary of two crustal plates, but Massachusetts is not.", "source": "arc_easy"}
{"text": "Question: Which of these describes a chemical change?\nAnswer:paper burning", "source": "arc_easy"}
{"text": "Question: A large tree was cut down with a saw. What is the best way to estimate the age of this tree?\nAnswer:count the number of rings in the trunk", "source": "arc_easy"}
{"text": "Question: From smallest to largest, the levels of organization in living things are\nAnswer:cells, tissues, organs, organ systems.", "source": "arc_easy"}
{"text": "Question: Which object is nonliving?\nAnswer:bicycle", "source": "arc_easy"}
{"text": "Question: What happens when oil and water are mixed?\nAnswer:The oil and water remain separate.", "source": "arc_easy"}
{"text": "Question: Students measure the time for toy cars of different masses to roll down a hill. Which of the following units should the students use to measure time?\nAnswer:seconds", "source": "arc_easy"}
{"text": "Question: A homeowner wants to use a renewable resource to heat the home. Which resource would be the best to use?\nAnswer:solar", "source": "arc_easy"}
{"text": "Question: Which of the following animal features most helps the animal move around in its habitat?\nAnswer:A sea turtle's flippers", "source": "arc_easy"}
{"text": "Question: A student observes cells in an object by using a microscope. The student thinks that the object was part of a living thing. Which statement explains why cell theory can be used to support the student's thinking?\nAnswer:Cell theory states that all living things are made of cells.", "source": "arc_easy"}
{"text": "Question: A researcher observes that an organism placed in a glass container filled with water moves away when a penlight is focused on the container. The researcher concludes that the organism is light sensitive. Which other explanation for the organism's response to the light is most possible?\nAnswer:The organism moves away from heat sources.", "source": "arc_easy"}
{"text": "Question: Which behavior is an example of an animal adapting to a change in the environment?\nAnswer:a bird migrating south", "source": "arc_easy"}
{"text": "Question: Mitochondria are cell organelles that play a large role in energy processes within the body. Which cells are most likely to have a greater amount of mitochondria?\nAnswer:muscle", "source": "arc_easy"}
{"text": "Question: Which would be the best method to use to dispose of cardboard boxes not utilized by a local grocery store?\nAnswer:have them recycled for future paper products", "source": "arc_easy"}
{"text": "Question: Which item is used for protection from chemical splashing?\nAnswer:safety goggles", "source": "arc_easy"}
{"text": "Question: Which processes change magma into igneous rock?\nAnswer:cooling and crystallization", "source": "arc_easy"}
{"text": "Question: Sophie investigates the water supply at her school and the things that affect it. Which action is a direct observation?\nAnswer:tasting water from a water fountain", "source": "arc_easy"}
{"text": "Question: Two identical books are on opposite ends of a table. Which of these would increase the gravitational force exerted between the two books?\nAnswer:decrease the distance between the books", "source": "arc_easy"}
{"text": "Question: When a guitar string is plucked, sound is produced by\nAnswer:the vibrations of the string.", "source": "arc_easy"}
{"text": "Question: What is the role of chlorophyll in photosynthesis?\nAnswer:absorbing light energy", "source": "arc_easy"}
{"text": "Question: Which tool should a student use to compare the masses of two small rocks?\nAnswer:balance", "source": "arc_easy"}
{"text": "Question: Which is an example of a chemical reaction?\nAnswer:Vinegar added to baking soda forms a gas.", "source": "arc_easy"}
{"text": "Question: Which type of evidence would a geologist need to support plate tectonic theory?\nAnswer:new crust formed by the sea floor spreading", "source": "arc_easy"}
{"text": "Question: An example of a learned trait is\nAnswer:being able to read", "source": "arc_easy"}
{"text": "Question: Angelo wants to know if the volume of water changes when it freezes. He measures the volume of water in its liquid state and then freezes it. Which tool did Angelo most likely use to measure the volume of the water?\nAnswer:a graduated cylinder", "source": "arc_easy"}
{"text": "Question: In order for a glider to fly, its weight must be opposed by\nAnswer:lift.", "source": "arc_easy"}
{"text": "Question: Why does the leaf of a plant look green?\nAnswer:Because it reflects green light", "source": "arc_easy"}
{"text": "Question: Which statement best describes the nature of sound?\nAnswer:Sound travels as longitudinal waves.", "source": "arc_easy"}
{"text": "Question: Which of these provides most of the oxygen in Earth's atmosphere?\nAnswer:ocean phytoplankton", "source": "arc_easy"}
{"text": "Question: A solution of lead (II) nitrate reacts with a solution of sodium iodide to produce a yellow solid of lead (II) iodide and aqueous sodium nitrate. Which of these illustrates the reaction?\nAnswer:Pb(NO_{3})_{2}(aq) + 2NaI(aq) -> PbI_{2}(s) + 2NaNO_{3}(aq)", "source": "arc_easy"}
{"text": "Question: A meteoroid becomes a meteorite when it\nAnswer:impacts the surface of a planet.", "source": "arc_easy"}
{"text": "Question: Which force causes rocks to roll downhill?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: Infectious diseases are caused by\nAnswer:microorganisms", "source": "arc_easy"}
{"text": "Question: A water wave that occurs in an ocean is an example of which type of wave?\nAnswer:transverse", "source": "arc_easy"}
{"text": "Question: Which of the following is an example of how insects are beneficial to humans?\nAnswer:Insects pollinate flowering plants.", "source": "arc_easy"}
{"text": "Question: In a closed system, what happens to the total energy of the system as energy conversions take place?\nAnswer:It remains constant.", "source": "arc_easy"}
{"text": "Question: Which of these organisms is a producer in a marine ecosystem?\nAnswer:algae", "source": "arc_easy"}
{"text": "Question: Which of the following describes a reason why companies irradiate some fruits and vegetables before they are sold to the public?\nAnswer:to extend the shelf life by killing existing microorganisms", "source": "arc_easy"}
{"text": "Question: A glacier is a slow moving river of ice. How does a glacier help create soil?\nAnswer:It scrapes small particles off large rocks.", "source": "arc_easy"}
{"text": "Question: During winter months, Amina sometimes notices ice covering the hoods of parked cars. Once the engine of the car runs for a while, the ice on the hood begins to melt. What form of energy is released from the car engine to melt the ice?\nAnswer:heat", "source": "arc_easy"}
{"text": "Question: A student notices dogs have more fleas in the summer than in the winter. Based on these observations, which is the most logical question for the student to investigate?\nAnswer:How does temperature affect the amount of fleas on dogs?", "source": "arc_easy"}
{"text": "Question: According to the periodic table, all of the following are metals except\nAnswer:fluorine", "source": "arc_easy"}
{"text": "Question: A squid is an animal that lives in the ocean. It pumps a stream of water out of its body, causing it to move rapidly. Which of the following mechanical systems moves in a way most similar to the squid?\nAnswer:a rocket", "source": "arc_easy"}
{"text": "Question: When the wax from a candle drips, the wax has reached\nAnswer:its melting point.", "source": "arc_easy"}
{"text": "Question: In the morning, students observed puddles of water all over the playground. What would best explain why the playground was dry in the afternoon?\nAnswer:The water evaporated during the day.", "source": "arc_easy"}
{"text": "Question: Many areas of Massachusetts have small deep ponds called kettle ponds. Which of the following best explains the formation of these ponds?\nAnswer:glacial depression", "source": "arc_easy"}
{"text": "Question: What relationship exists between a dog and its fleas?\nAnswer:parasitism", "source": "arc_easy"}
{"text": "Question: Which of the following could limit the supply of a renewable resource?\nAnswer:cutting down trees in forests", "source": "arc_easy"}
{"text": "Question: Which statement best describes the energy transformations that occur when a candle burns?\nAnswer:Chemical energy from the wax is converted into light and heat energy.", "source": "arc_easy"}
{"text": "Question: Pesticides and fertilizers can help farmers to produce more crops. However, overuse of these chemicals can result in\nAnswer:environmental pollution", "source": "arc_easy"}
{"text": "Question: What type of energy travels through the body of a microscope that allows the specimen to be seen by a student?\nAnswer:light", "source": "arc_easy"}
{"text": "Question: A powder made up of both white specks and black specks is likely to be\nAnswer:a mixture", "source": "arc_easy"}
{"text": "Question: In the past, wild hogs called \"javelinas\" were seen only in the southern part of New Mexico. Now, javelinas are seen in areas 100 miles further north. What is the most likely cause of this expansion?\nAnswer:Environmental conditions have changed.", "source": "arc_easy"}
{"text": "Question: Which is the best example of a pure substance?\nAnswer:gold", "source": "arc_easy"}
{"text": "Question: Which tool would best help a person observe the parts of a plant cell?\nAnswer:microscope", "source": "arc_easy"}
{"text": "Question: The energy stored in the bonds of a glucose molecule during photosynthesis is in what form?\nAnswer:chemical", "source": "arc_easy"}
{"text": "Question: What happens to water molecules during the boiling process?\nAnswer:They move faster and move farther apart as they absorb heat.", "source": "arc_easy"}
{"text": "Question: Evidence suggests that there is a relationship between ancient dinosaurs and modern birds. Through time, each occurrence of a new trait most likely resulted from which of the following?\nAnswer:mutation of genes", "source": "arc_easy"}
{"text": "Question: Which of the following can cause erosion?\nAnswer:flowing water", "source": "arc_easy"}
{"text": "Question: Living things are classified as producers or consumers according to\nAnswer:how they obtain food", "source": "arc_easy"}
{"text": "Question: A hydrologist studies the location, movement, and quality of water. A hydrologist recognizes the importance that water exists as ___.\nAnswer:a solid, a liquid, and a gas (vapor)", "source": "arc_easy"}
{"text": "Question: Which of these can be recycled in an attempt to conserve resources?\nAnswer:aluminum", "source": "arc_easy"}
{"text": "Question: This in turn causes the average temperature on Earth to rise. Which of the following observations supports that theory?\nAnswer:Carbon dioxide in the upper atmosphere absorbs and re-emits heat radiated from Earth's surface.", "source": "arc_easy"}
{"text": "Question: Which of these can be mined from Earth and used as an energy source?\nAnswer:Coal", "source": "arc_easy"}
{"text": "Question: Which tool is used to determine how long it takes warm water to melt an ice cube?\nAnswer:a stopwatch", "source": "arc_easy"}
{"text": "Question: Two scientists doing the same experiment got different results. Which would be the best way to figure out which result might be correct?\nAnswer:More scientists should do the experiment.", "source": "arc_easy"}
{"text": "Question: A lipid bilayer allows certain molecules to pass through and blocks other molecules. Which structure is most often protected by a lipid bilayer?\nAnswer:cell", "source": "arc_easy"}
{"text": "Question: Traits are transferred from generation to generation through the\nAnswer:sperm and the egg", "source": "arc_easy"}
{"text": "Question: Many scientists theorize that global warming will melt the polar ice caps. What would most likely happen if the polar ice caps melted?\nAnswer:Ocean levels would increase.", "source": "arc_easy"}
{"text": "Question: Which of the following groups of organisms uses sunlight to convert carbon dioxide and water into sugar and oxygen?\nAnswer:producers", "source": "arc_easy"}
{"text": "Question: What is the first step in designing a product?\nAnswer:identify the need or want", "source": "arc_easy"}
{"text": "Question: Solids that are combined together and maintain their physical properties are best labeled as a\nAnswer:mixture.", "source": "arc_easy"}
{"text": "Question: A group of vertebrates has lungs, a body covered with scales, internal fertilization, and amniotic eggs. Which group of vertebrates does this describe?\nAnswer:reptiles", "source": "arc_easy"}
{"text": "Question: The brain, spinal cord, and nerves are organs that perform which primary function?\nAnswer:conducting messages to coordinate body functions", "source": "arc_easy"}
{"text": "Question: Mammals must eliminate waste products that their bodies produce. Which organ helps mammals eliminate bodily waste?\nAnswer:kidney", "source": "arc_easy"}
{"text": "Question: A pot is heated on a stove. Which process causes the metal handle of the pot to also become hot?\nAnswer:conduction", "source": "arc_easy"}
{"text": "Question: In making a pizza, which process involves a chemical change?\nAnswer:baking the dough to form the crust", "source": "arc_easy"}
{"text": "Question: Base your answers on the information below. One hot, summer day it rained very heavily. After the rain, a plastic pan on a picnic table had 2 cm of rainwater in it. Four hours later, all the rainwater in the pan was gone. Which process caused the rainwater in the pan to disappear as it sat outside in the hot air?\nAnswer:evaporation", "source": "arc_easy"}
{"text": "Question: Which process must occur for clouds to form?\nAnswer:condensation", "source": "arc_easy"}
{"text": "Question: In 1918, an outbreak of influenza infected 500,000 people all over the world. Tens of millions of those infected died. In 1994, an outbreak of pneumonic plague spread quickly through the city of Surat in India, killing 52 people. Which statement best describes the two events?\nAnswer:The influenza outbreak was a pandemic. The plague outbreak was an epidemic.", "source": "arc_easy"}
{"text": "Question: On the periodic table, the elements in group 18 (8A) (helium, neon, argon, etc.) are grouped together because\nAnswer:they have full outer electron shells.", "source": "arc_easy"}
{"text": "Question: Which of the following is a consumer?\nAnswer:rabbit", "source": "arc_easy"}
{"text": "Question: Which statement explains why light from the Sun can warm up water in a glass?\nAnswer:Water absorbs light energy.", "source": "arc_easy"}
{"text": "Question: Which characteristic is an example of learned behavior?\nAnswer:a dog scratching at a door to go out", "source": "arc_easy"}
{"text": "Question: Which of these is a negative effect associated with some types of new technology?\nAnswer:decreased physical activity", "source": "arc_easy"}
{"text": "Question: What is the main source of energy for the water cycle?\nAnswer:sunlight", "source": "arc_easy"}
{"text": "Question: Sharpening a pencil and tearing paper are examples of physical changes. Which statement describes why these are physical changes?\nAnswer:There is a change in the appearance of the objects.", "source": "arc_easy"}
{"text": "Question: Air in the atmosphere is heated unevenly by the sun, causing\nAnswer:wind patterns.", "source": "arc_easy"}
{"text": "Question: Which sense is used to determine an object's texture?\nAnswer:touch", "source": "arc_easy"}
{"text": "Question: Which statement describes a method of sexual reproduction that occurs in plants?\nAnswer:Seeds are produced from the flower of the plant.", "source": "arc_easy"}
{"text": "Question: Campers shouted toward a canyon wall. What characteristic of sound best explains why the campers heard an echo?\nAnswer:Sound waves reflected off the canyon wall.", "source": "arc_easy"}
{"text": "Question: A recent scientific study funded by a medical corporation concluded that its product is not as harmful as consumers have reported. Identify a possible problem with this study.\nAnswer:The results of the study may be influenced by bias.", "source": "arc_easy"}
{"text": "Question: Nerve cells transmitting messages to the body best demonstrate which primary function?\nAnswer:the transfer of energy", "source": "arc_easy"}
{"text": "Question: A drinking water reservoir for a small town develops a blue-green algae bloom. The town hires a company to eliminate the problem. Which of the following should the company investigate first as a likely source of the problem?\nAnswer:a neighborhood where lawn chemicals are used", "source": "arc_easy"}
{"text": "Question: What travels through the stem of a plant?\nAnswer:water and food", "source": "arc_easy"}
{"text": "Question: Which of these is an inherited behavior?\nAnswer:a spider spinning a web", "source": "arc_easy"}
{"text": "Question: In 1987, a supernova was detected in the Large Magellanic Cloud galaxy, which is approximately 169,000 light years from Earth. Which event produces a supernova?\nAnswer:the explosion of a massive star", "source": "arc_easy"}
{"text": "Question: Extinction of a species is most likely to occur as a result of\nAnswer:environmental changes", "source": "arc_easy"}
{"text": "Question: When water vapor rises and cools, the liquid water in the air comes together forming\nAnswer:clouds.", "source": "arc_easy"}
{"text": "Question: Which of the following allows materials to enter and leave a cell?\nAnswer:cell membrane", "source": "arc_easy"}
{"text": "Question: Sandy and Keith plan to move a 6-kilogram block. If they wanted to calculate the mechanical energy required to move the block, what units would they use to report their answer?\nAnswer:joules", "source": "arc_easy"}
{"text": "Question: DNA stores the genetic instructions transferred from one generation to the next. What is DNA?\nAnswer:a molecule", "source": "arc_easy"}
{"text": "Question: Which list is correctly ordered from smallest to largest?\nAnswer:Organism, population, community, ecosystem", "source": "arc_easy"}
{"text": "Question: Which of the following has the greatest effect on the ability of soil to hold water?\nAnswer:the size of the soil particles", "source": "arc_easy"}
{"text": "Question: The Water Quality Act of 1987 required the development of standards that would prevent toxic pollutants from reaching dangerous levels in bodies of water. This act affected the amounts of toxic chemicals that could be discharged into bodies of water. Which of the following would have been most regulated by this act?\nAnswer:paper mills", "source": "arc_easy"}
{"text": "Question: Which element is necessary for the formation of coal?\nAnswer:decaying vegetation", "source": "arc_easy"}
{"text": "Question: Some ancient Greeks tried to discover the laws of the universe through thought and logic. Which part of the scientific process were these scientists missing?\nAnswer:experiment", "source": "arc_easy"}
{"text": "Question: Which best describes a characteristic of the jet stream?\nAnswer:It forms a boundary between a cold air mass and a warm air mass.", "source": "arc_easy"}
{"text": "Question: Single-celled organisms can reproduce and create cells exactly like themselves without combining genes from two different parent cells. When they do this, they use a type of\nAnswer:asexual reproduction.", "source": "arc_easy"}
{"text": "Question: Most stars are similar to each other in\nAnswer:composition.", "source": "arc_easy"}
{"text": "Question: Which BEST explains why green marine algae are most often restricted to the top 100 meters of the ocean?\nAnswer:They can live only where there is light.", "source": "arc_easy"}
{"text": "Question: Which of these locations in the solar system contains the most asteroids?\nAnswer:between Mars and Jupiter", "source": "arc_easy"}
{"text": "Question: The body is able to detect pressure on its surface by which direct means?\nAnswer:signaling by sensory neurons", "source": "arc_easy"}
{"text": "Question: Which of these is an organism that is unicellular?\nAnswer:amoeba", "source": "arc_easy"}
{"text": "Question: Mark wants to make lemonade for his friends. He uses water, lemon juice, and sugar. Which of these best describes the lemonade?\nAnswer:a mixture", "source": "arc_easy"}
{"text": "Question: Sandra puts some pill bugs into an open box. She covers half the box with a piece of cardboard. She then places the box outside on a summer day, and all the pill bugs move under the cardboard. The pill bugs are most likely responding to which of the following?\nAnswer:bright light", "source": "arc_easy"}
{"text": "Question: During science class, students combined 1 kg of iron filings with 1 kg of sand to create a mixture. Which of the following methods would be best for separating the iron filings from the sand?\nAnswer:Drag a magnet through the mixture to attract the iron filings.", "source": "arc_easy"}
{"text": "Question: Which is the thickest layer of Earth?\nAnswer:mantle", "source": "arc_easy"}
{"text": "Question: Wind can cause erosion that changes the surface of the Earth. Wind erosion can have negative effects on the environment by removing soil and polluting the air during dust storms. Which of the following land forms are created by wind erosion?\nAnswer:sand dunes and arches", "source": "arc_easy"}
{"text": "Question: Deer eat different types of plants in an ecosystem. Which method would best show the percentages of the plant types in the deer diet?\nAnswer:pie chart", "source": "arc_easy"}
{"text": "Question: How does a human body get energy?\nAnswer:Food and oxygen combine to deliver energy.", "source": "arc_easy"}
{"text": "Question: Some birds fly south before winter each year. This is an example of\nAnswer:migration", "source": "arc_easy"}
{"text": "Question: Which system supports the body, protects internal organs, and makes blood cells?\nAnswer:skeletal system", "source": "arc_easy"}
{"text": "Question: The smallest particle of an element is\nAnswer:an atom.", "source": "arc_easy"}
{"text": "Question: A student is writing a report on volcanoes. What should the student include to best help explain how a volcano works?\nAnswer:a diagram showing the structure of a volcano", "source": "arc_easy"}
{"text": "Question: Base your answer on the information below and on your knowledge of science. A baseball strikes the roof of a car and dents it. The paint on the roof begins to crack and chip, exposing the metal. The exposed metal on the roof rusts, eventually causing a small hole in the roof. Which event is a chemical change?\nAnswer:The exposed metal rusts.", "source": "arc_easy"}
{"text": "Question: Which energy resource is renewable?\nAnswer:wind", "source": "arc_easy"}
{"text": "Question: Which energy conversion process occurs whenever coal is burned?\nAnswer:chemical to thermal", "source": "arc_easy"}
{"text": "Question: Claudia's teacher places a photograph of an organism on the board. He asks Claudia to determine if the organism is a plant or an animal. The answer to which question will best help Claudia determine if the organism is a plant or an animal?\nAnswer:Does the organism make its own food?", "source": "arc_easy"}
{"text": "Question: Based on analysis of deep ice cores from the Arctic, scientists theorize that early humans caused air pollution. These scientists can make sure their data is correct by\nAnswer:analyzing more than one ice core.", "source": "arc_easy"}
{"text": "Question: When a volcano erupts, dust and ash are blown into the atmosphere. The eruption directly reduces the transfer of energy from\nAnswer:the Sun to plants.", "source": "arc_easy"}
{"text": "Question: Which change would most likely cause deer to die or leave a woodland?\nAnswer:a forest fire", "source": "arc_easy"}
{"text": "Question: A student observes a glowing band across the night sky. This glowing band is most likely\nAnswer:a partial view of the Milky Way galaxy.", "source": "arc_easy"}
{"text": "Question: What is the smallest unit of an element that still has the properties of that element?\nAnswer:an atom", "source": "arc_easy"}
{"text": "Question: The longitude of a location determines which time zone it is in. Different time zones are the result of\nAnswer:Earth's rotation", "source": "arc_easy"}
{"text": "Question: Which of these structures form when materials are deposited, buried, and cemented?\nAnswer:sedimentary rocks", "source": "arc_easy"}
{"text": "Question: Earth is made of different layers that have varying characteristics. Which is the thickest layer?\nAnswer:the mantle", "source": "arc_easy"}
{"text": "Question: Which are examples of inherited traits?\nAnswer:nose shape", "source": "arc_easy"}
{"text": "Question: An object has a weight of 10 kg on the surface of Earth. If the same object were transported to the surface of Mars, the object would have a weight of 3.8 kg. Which best explains why the weight of the object changed when transported from Earth to Mars?\nAnswer:Gravitational force is greater on Earth than it is on Mars.", "source": "arc_easy"}
{"text": "Question: Which characteristic can a puppy inherit from its parents?\nAnswer:spotted fur", "source": "arc_easy"}
{"text": "Question: According to Darwin's theory of evolution, the variations among finches that he observed in the Galapagos Islands resulted from\nAnswer:natural selection.", "source": "arc_easy"}
{"text": "Question: Jennifer has collected rocks while hiking. As she attempts to classify her rocks, which will she put in the pile of sedimentary rocks?\nAnswer:Rocks with visible pieces of shells in them", "source": "arc_easy"}
{"text": "Question: Which form of energy is found in food?\nAnswer:chemical", "source": "arc_easy"}
{"text": "Question: The Sun is a medium-sized star and is expected to continue to perform nuclear fusion for five billion years. What is most likely to be the final stage of the Sun?\nAnswer:white dwarf", "source": "arc_easy"}
{"text": "Question: Which statement is the best description of the Milky Way galaxy?\nAnswer:a group of stars, dust, and planets held together by gravity", "source": "arc_easy"}
{"text": "Question: When specific hormones are present in the blood of a hen, an egg is released from an ovary. Which two systems are involved with the release of an egg?\nAnswer:endocrine and reproductive systems", "source": "arc_easy"}
{"text": "Question: Fossil records indicate that Earth was first inhabited by bacteria-like organisms. These organisms\nAnswer:were single-celled.", "source": "arc_easy"}
{"text": "Question: Onions can reproduce from bulbs. One parent bulb generates daughter bulbs with duplicate genetic information. Which is the most likely advantage of this kind of reproduction?\nAnswer:Large quantities of individuals can be produced rapidly.", "source": "arc_easy"}
{"text": "Question: Which action involving a pulley system requires the least amount of force?\nAnswer:using several pulleys together instead of a single pulley", "source": "arc_easy"}
{"text": "Question: In which environment would a white rabbit be best protected from predators?\nAnswer:a snowy field", "source": "arc_easy"}
{"text": "Question: Which form of energy is needed to change water from a liquid to a gas?\nAnswer:heat", "source": "arc_easy"}
{"text": "Question: Which of these is a function of a leaf?\nAnswer:Converting solar energy into sugar", "source": "arc_easy"}
{"text": "Question: Which of these is most likely to be spread when two people drink from the same water bottle?\nAnswer:strep throat", "source": "arc_easy"}
{"text": "Question: The sum of all chemical reactions in the human body is known as\nAnswer:metabolism", "source": "arc_easy"}
{"text": "Question: The water contained in a geyser system gains energy from the underground material surrounding it. The water molecules gain kinetic energy and this results in an increase in the pressure of the water. Eventually the geyser erupts and expels water into the air above ground. Which of the following types of energy is the source for the initial energy gain of the water?\nAnswer:thermal", "source": "arc_easy"}
{"text": "Question: In a laboratory activity, four different types of rock were placed in identical acid solutions for one week. Each sample was then measured to see if any of the rock mass was dissolved by the acid solution. Which is the dependent (responding) variable in this activity?\nAnswer:the amount of dissolved rock", "source": "arc_easy"}
{"text": "Question: Which cell structure carries out a function for a cell that is similar to the function that bark carries out for a tree?\nAnswer:cell wall", "source": "arc_easy"}
{"text": "Question: The number of squirrels in a certain ecosystem changes over time. These changes can be represented as a number of connected data points. Which method would a student most likely use to show this information?\nAnswer:line graph", "source": "arc_easy"}
{"text": "Question: Pedro shook a can of soda. When the soda was opened, foam and soda burst from the can. Which statement best explains what happened?\nAnswer:The gas pressure was released from the can.", "source": "arc_easy"}
{"text": "Question: Where is most of Earth's water located?\nAnswer:oceans", "source": "arc_easy"}
{"text": "Question: Investigations were performed to test several methods of keeping petals from falling off flowers that had been cut. Which is the most likely reason for this investigation?\nAnswer:to test a hypothesis", "source": "arc_easy"}
{"text": "Question: Two seismographs are placed 500 km from an active fault line, one on each side of the active fault line. During an earthquake, what most likely accounts for the different readings on the seismographs?\nAnswer:the different media through which the waves travel", "source": "arc_easy"}
{"text": "Question: Scientists dig in a dry area at the bottom of a mountain range. Fossilized shells of freshwater mussels are found in the area. Which is a likely conclusion that scientists will draw based on this evidence?\nAnswer:Rivers once flowed through the area.", "source": "arc_easy"}
{"text": "Question: An apple appears red when struck by white light. This appearance is because the red light is reflected and the other colors are absorbed. What color will this apple appear to be when struck by blue light?\nAnswer:black", "source": "arc_easy"}
{"text": "Question: In New York State, an observer will usually see the Sun rise in the\nAnswer:east", "source": "arc_easy"}
{"text": "Question: Burning coal and natural gas are ways to produce electricity. Both coal and natural gas are nonrenewable resources. Which is an example of producing electricity using a renewable source of energy?\nAnswer:heating a home with energy collected by solar panels", "source": "arc_easy"}
{"text": "Question: When liquid water freezes, it forms ice. What is the physical state of an ice cube?\nAnswer:solid", "source": "arc_easy"}
{"text": "Question: A student uses a hand lens to observe which of these objects?\nAnswer:an insect", "source": "arc_easy"}
{"text": "Question: Which type of rock would most likely contain a fossil?\nAnswer:sedimentary rock", "source": "arc_easy"}
{"text": "Question: Some events on Earth happen instantly while others take thousands of years to occur. Which process takes the longest time to complete?\nAnswer:weathering of a rock to form small rocks and sand", "source": "arc_easy"}
{"text": "Question: Where do many of the basic life functions take place in organisms?\nAnswer:cells", "source": "arc_easy"}
{"text": "Question: Which physical structure would best help a bear to survive a winter in New York State?\nAnswer:thick fur", "source": "arc_easy"}
{"text": "Question: What is made when sugar is dissolved in water?\nAnswer:a solution", "source": "arc_easy"}
{"text": "Question: Gasoline for cars is produced from fossil fuels. Using gasoline can most likely lead to which environmental problem?\nAnswer:global warming", "source": "arc_easy"}
{"text": "Question: Which of the following is a cause of the ocean levels periodically rising and then falling?\nAnswer:the force of gravity from the Moon", "source": "arc_easy"}
{"text": "Question: A scientist is searching for areas where new solar systems might form. What feature is the scientist looking for?\nAnswer:a cloud of dust and gas", "source": "arc_easy"}
{"text": "Question: About how often is a full moon observed from Earth's surface?\nAnswer:once a month", "source": "arc_easy"}
{"text": "Question: When animals use energy, they produce\nAnswer:carbon dioxide", "source": "arc_easy"}
{"text": "Question: Which would provide evidence of seafloor spreading?\nAnswer:cooled magma found on the edge of the plates", "source": "arc_easy"}
{"text": "Question: Mitosis occurs in living things when a cell divides to produce two cells. Compared to the original cell, how many chromosomes are in each of the resulting cells?\nAnswer:the same number", "source": "arc_easy"}
{"text": "Question: Which organ directly works to protect the human body from disease?\nAnswer:skin", "source": "arc_easy"}
{"text": "Question: Steven went to a farm and picked a bright red tomato from a broken branch on the plant. The tomato had a rotten spot with a worm inside of it. Instead of eating the tomato, Steven decided to plant the seeds and grow new tomato plants. Which characteristic of the tomato plant is inherited and could change over several generations?\nAnswer:color of the skin", "source": "arc_easy"}
{"text": "Question: Many leaves appear green because the leaves\nAnswer:reflect green light.", "source": "arc_easy"}
{"text": "Question: Which of these is the best definition of heredity?\nAnswer:the passage of genetic information from one generation to the next", "source": "arc_easy"}
{"text": "Question: Which of the following describes how a microwave oven heats food?\nAnswer:Water molecules in the food absorb the energy of microwave radiation.", "source": "arc_easy"}
{"text": "Question: Which three systems of the human body function together to move and control body parts?\nAnswer:nervous, skeletal, and muscular", "source": "arc_easy"}
{"text": "Question: Astronomers have found evidence for the existence of a super-massive black hole in the center of the giant elliptical galaxy M87. What is thought to cause black holes to form?\nAnswer:the collapse of a high-mass star", "source": "arc_easy"}
{"text": "Question: A research team wanted to produce a smaller variety of German shepherd dogs. They mated the smallest dogs from different litters for several generations. This is an example of which concept?\nAnswer:selective breeding", "source": "arc_easy"}
{"text": "Question: A class learns about weather. The students in the class measure the outside air temperature at the same time each day. Which way of measuring the temperature would provide the most accurate data?\nAnswer:recording the measurements from three thermometers", "source": "arc_easy"}
{"text": "Question: Earth's magnetosphere is not uniformly shaped. It is compressed on the side facing the Sun and has a long tail extending away from the Sun. Which phenomenon is responsible for this shape?\nAnswer:solar winds bringing high-energy particles toward Earth", "source": "arc_easy"}
{"text": "Question: Which living organism makes its own food using sunlight?\nAnswer:tree", "source": "arc_easy"}
{"text": "Question: Who was the first person to base a system of classification on organisms having similar structures?\nAnswer:Linnaeus", "source": "arc_easy"}
{"text": "Question: Which is a process that converts sunlight energy into a compound that stores chemical energy?\nAnswer:photosynthesis", "source": "arc_easy"}
{"text": "Question: Which most likely contributed to the extinction of many species and endangered the survival of others?\nAnswer:habitat destruction", "source": "arc_easy"}
{"text": "Question: Which is the most basic unit of living things?\nAnswer:Cells", "source": "arc_easy"}
{"text": "Question: What are the two main jobs of the skeletal system?\nAnswer:support and protect the body", "source": "arc_easy"}
{"text": "Question: Which is an example of a chemical change?\nAnswer:a nail rusting in water", "source": "arc_easy"}
{"text": "Question: Which of these is a renewable resource found in Nevada?\nAnswer:geothermal energy", "source": "arc_easy"}
{"text": "Question: Which two body systems are involved in inhaling oxygen and exhaling carbon dioxide?\nAnswer:circulatory and respiratory", "source": "arc_easy"}
{"text": "Question: Materials such as carbon and nitrogen go through cycles. The cycling of nitrogen waste materials is mostly dependent upon the role of which factor?\nAnswer:bacteria", "source": "arc_easy"}
{"text": "Question: Which of these is unique to the process of scientific investigation?\nAnswer:collecting data in an experiment", "source": "arc_easy"}
{"text": "Question: Which did Thomas Edison invent?\nAnswer:light bulb", "source": "arc_easy"}
{"text": "Question: If soil is permeable\nAnswer:water easily flows through it.", "source": "arc_easy"}
{"text": "Question: Sally is making candy on the stove. She places a thermometer in the candy. What is she measuring?\nAnswer:temperature", "source": "arc_easy"}
{"text": "Question: Anthony and Zach want to know how the temperature of the air affects the temperature of lake water. Which type of tool should they use to measure the temperatures?\nAnswer:thermometer", "source": "arc_easy"}
{"text": "Question: Which serve as evidence for a scientific theory?\nAnswer:observations", "source": "arc_easy"}
{"text": "Question: Which of the following identifies the primary function of a radio station tower in a communication system?\nAnswer:transmitter", "source": "arc_easy"}
{"text": "Question: Down feathers are used by many sleeping bag manufacturers because down feathers are\nAnswer:good insulators.", "source": "arc_easy"}
{"text": "Question: A farmer sprayed his orange trees with a pesticide to eliminate the insects damaging the trees. Some of the insects survived and produced offspring that were also resistant to the insecticide. Which process is illustrated by the pesticide resistance of the offspring?\nAnswer:natural selection", "source": "arc_easy"}
{"text": "Question: An elephant is a multicellular organism that weighs about 200 pounds at birth and can grow to weigh as much as 15,000 pounds. What increases as the elephant grows into an adult?\nAnswer:the number of cells in its body", "source": "arc_easy"}
{"text": "Question: The human body is made up of organ systems that work together as one unit. Which systems work together to prepare and distribute food for cells?\nAnswer:digestive and circulatory", "source": "arc_easy"}
{"text": "Question: The human body is composed of different systems made of specialized cells, tissues, and organs. Each of these structures has a specific function that aids in the survival of the human species. Which organs are used in reproduction?\nAnswer:ovaries, uterus, and fallopian tubes", "source": "arc_easy"}
{"text": "Question: Which type of organism is at the lowest level of the food chain?\nAnswer:autotroph", "source": "arc_easy"}
{"text": "Question: Jake's cats eat food from a can. The cats come running into the kitchen when they hear the electric can opener. Now, each time Jake's mother opens a can of corn, the cats come running. This is an example of\nAnswer:learned behavior", "source": "arc_easy"}
{"text": "Question: A team of surveyors takes measurements of ground altitude at horizontal intervals of 1 meter over a 400 square meter area. These measurements can best be used to produce which representation of the area?\nAnswer:a topographical map", "source": "arc_easy"}
{"text": "Question: Some schools have programs to recycle paper products such as student papers, newspapers, and cardboard boxes. Which of these statements describes a positive effect of recycling paper products?\nAnswer:Fewer trees need to be cut.", "source": "arc_easy"}
{"text": "Question: Light sometimes behaves as waves and other times as particles. Which property of light is equally explainable by treating light as either particles or waves?\nAnswer:reflection of light", "source": "arc_easy"}
{"text": "Question: The topography of Nevada is dominated by basins and mountain ranges associated with which geological phenomena?\nAnswer:faults", "source": "arc_easy"}
{"text": "Question: Which biological activity occurs in a repeated rhythm?\nAnswer:breathing", "source": "arc_easy"}
{"text": "Question: Which model best illustrates the wave property that enables scientists to explore Earth's interior using seismic waves?\nAnswer:shining a light through a prism", "source": "arc_easy"}
{"text": "Question: In 1933, a hurricane came ashore at Ocean City, Maryland. A hurricane negatively affects a coastline by\nAnswer:causing erosion", "source": "arc_easy"}
{"text": "Question: Which statement describes the location of our Sun in the universe?\nAnswer:Our Sun is the center of a solar system in the Milky Way galaxy.", "source": "arc_easy"}
{"text": "Question: Scientists claim that the area around the Grand Canyon was once covered by an ocean. What evidence would support their claim?\nAnswer:Fossils of ocean animals were found at the Grand Canyon.", "source": "arc_easy"}
{"text": "Question: Which is true of scientific discoveries?\nAnswer:Sometimes scientific discoveries are made by accident, like the discovery of penicillin.", "source": "arc_easy"}
{"text": "Question: Which is a process that most likely formed the Appalachian Mountains found in the eastern part of North America?\nAnswer:plate tectonics", "source": "arc_easy"}
{"text": "Question: Which technology used to generate electrical power involves a trade-off between economical electricity and long-term waste disposal problems?\nAnswer:nuclear reactor", "source": "arc_easy"}
{"text": "Question: All the ponds in an area dried up during a drought. The population of which of the following animals that live in the area is most affected by the drought?\nAnswer:frog", "source": "arc_easy"}
{"text": "Question: Which substance is usually found in nature as a liquid, solid, and gas?\nAnswer:water", "source": "arc_easy"}
{"text": "Question: The scientific name for a giraffe is Giraffa camelopardalis. What two levels of classification does this name represent?\nAnswer:genus and species", "source": "arc_easy"}
{"text": "Question: The Moon has the greatest effect on Earth's\nAnswer:ocean tides", "source": "arc_easy"}
{"text": "Question: Granite is classified as a rock because it\nAnswer:is made of minerals.", "source": "arc_easy"}
{"text": "Question: The measure of the amount of light received on Earth from a star is known as\nAnswer:apparent magnitude.", "source": "arc_easy"}
{"text": "Question: Heat from deep in Earth's interior is transferred to its crust by which of the following?\nAnswer:convection in the mantle", "source": "arc_easy"}
{"text": "Question: The growth of which of the following usually occurs first in primary succession on a bare rock?\nAnswer:Lichens", "source": "arc_easy"}
{"text": "Question: The process by which water vapor in the atmosphere cools and becomes a liquid is called\nAnswer:condensation.", "source": "arc_easy"}
{"text": "Question: A student is dropping objects of various sizes and shapes and recording the time it takes for each object to hit the ground. Which question is the student most likely trying to answer?\nAnswer:Do some objects fall more quickly than others?", "source": "arc_easy"}
{"text": "Question: Which two processes in the water cycle are primarily responsible for the creation of a lake?\nAnswer:precipitation and runoff", "source": "arc_easy"}
{"text": "Question: The correct procedure after completing a laboratory experiment is to\nAnswer:collect and store recyclable material.", "source": "arc_easy"}
{"text": "Question: Which is an example of primary ecological succession?\nAnswer:lichen growth on rocks", "source": "arc_easy"}
{"text": "Question: What is true of mutualistic relationships among organisms?\nAnswer:The organisms cooperate with each other.", "source": "arc_easy"}
{"text": "Question: Carolina uses a microscope to view a soil sample taken from her backyard. Which part of the soil would she ONLY be able to see with a microscope?\nAnswer:bacteria", "source": "arc_easy"}
{"text": "Question: The part of the rock cycle that transforms compressed rock formed from sea organism shells into a harder, denser rock is\nAnswer:sedimentary rock becoming metamorphic rock.", "source": "arc_easy"}
{"text": "Question: A group of scientists predicts that Earth's oceans will be able to take up more carbon dioxide as atmospheric carbon dioxide levels increase and the atmosphere warms. Which of these statements about the solubility of gases in ocean water would lead you to question this prediction?\nAnswer:Solubility decreases with an increase in temperature.", "source": "arc_easy"}
{"text": "Question: Which of the following elements is best able to combine with itself and hydrogen [H] to form large molecules?\nAnswer:carbon [C]", "source": "arc_easy"}
{"text": "Question: Growing thicker fur in the winter helps some animals to\nAnswer:keep warm", "source": "arc_easy"}
{"text": "Question: Several types of mechanisms in the body regulate the rate of chemical reactions in the digestive system. Among the most important are feedback systems, which control the release rate of\nAnswer:enzymes.", "source": "arc_easy"}
{"text": "Question: The water in a pond gets colder one night. Which tool is best to observe its temperature change?\nAnswer:thermometer", "source": "arc_easy"}
{"text": "Question: During subduction, one tectonic plate is forced below another. The subducting plate is forced into the\nAnswer:asthenosphere.", "source": "arc_easy"}
{"text": "Question: What two gases make up most of the Earth's atmosphere?\nAnswer:Oxygen and nitrogen", "source": "arc_easy"}
{"text": "Question: A light-year is a measure of\nAnswer:distance.", "source": "arc_easy"}
{"text": "Question: Some birds live in a forest. If many of the trees in the forest are cut down, the shelter for the birds will\nAnswer:decrease", "source": "arc_easy"}
{"text": "Question: In the human body, cellular respiration breaks down sugar molecules after they enter the cell. What results from this process?\nAnswer:release of energy", "source": "arc_easy"}
{"text": "Question: What causes a person to have blue eyes?\nAnswer:receiving a gene for blue eyes from each parent", "source": "arc_easy"}
{"text": "Question: When an atom loses or gains an electron, it changes\nAnswer:charge.", "source": "arc_easy"}
{"text": "Question: In which pair of elements are both metalloids?\nAnswer:Sb and Te", "source": "arc_easy"}
{"text": "Question: Florida has a large supply of phosphate that ancient seas deposited millions of years ago. The phosphate contains the remains of animals that were deposited in layers on the sea floor. Which type of rock did the phosphate become?\nAnswer:organic sedimentary", "source": "arc_easy"}
{"text": "Question: After months of studying and obtaining data on the behavior of birds, biologists from around the world will look at the data and\nAnswer:come up with several possible interpretations.", "source": "arc_easy"}
{"text": "Question: Which mixture can be easily separated by adding water and pouring it through a coffee filter?\nAnswer:salt and sand", "source": "arc_easy"}
{"text": "Question: Living things depend on energy from\nAnswer:the Sun", "source": "arc_easy"}
{"text": "Question: Research into the total amount of oil available for use around the world can affect what kind of human choice?\nAnswer:how to travel to work", "source": "arc_easy"}
{"text": "Question: Hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to produce a saltwater solution. What are the products of this chemical reaction?\nAnswer:NaCl and H_{2}O", "source": "arc_easy"}
{"text": "Question: Which human activity most often has a harmful effect on the environment?\nAnswer:polluting", "source": "arc_easy"}
{"text": "Question: Young frogs do not resemble adult frogs. Which term is given to this pattern of development in frogs?\nAnswer:metamorphosis", "source": "arc_easy"}
{"text": "Question: Bones support the body. What pulls and pushes on bones to move them?\nAnswer:muscles", "source": "arc_easy"}
{"text": "Question: Which statement best describes why a calcium-fortified juice would advertise that it is good for growing children?\nAnswer:Calcium helps the growth of bones.", "source": "arc_easy"}
{"text": "Question: Which of these tectonic plate boundaries is most likely to form a volcano?\nAnswer:an oceanic plate colliding into a continental plate", "source": "arc_easy"}
{"text": "Question: Which of the following is an example of heat transfer by conduction?\nAnswer:a whole metal spoon getting hot when one end is in hot soup", "source": "arc_easy"}
{"text": "Question: Alicia gives her brother a push while he is seated on a swing. She finds that after a few seconds, she needs to push again to keep him going. The reason her brother slows down is because the mechanical energy is converted into\nAnswer:thermal energy that is released into the atmosphere.", "source": "arc_easy"}
{"text": "Question: An example of a learned behavior is a\nAnswer:dog laying down on command.", "source": "arc_easy"}
{"text": "Question: An atom consists of a nucleus surrounded by\nAnswer:electrons.", "source": "arc_easy"}
{"text": "Question: Which of these causes the atmosphere to change?\nAnswer:increased buildup of greenhouse gases", "source": "arc_easy"}
{"text": "Question: Which element is most likely to form an ion with a negative 2 charge?\nAnswer:oxygen", "source": "arc_easy"}
{"text": "Question: Mount St. Helens was a cone-shaped mountain that formed when molten material reached the surface of Earth and formed layers. Cone-shaped mountains form as a result of which one of these events?\nAnswer:volcanic eruptions", "source": "arc_easy"}
{"text": "Question: Which process in the water cycle would be accelerated by an increase in temperature?\nAnswer:evaporation", "source": "arc_easy"}
{"text": "Question: Which of the following foods is highest in polysaccharides?\nAnswer:potatoes", "source": "arc_easy"}
{"text": "Question: Colored alcohol is used in some glass thermometers. When placed in air of different temperatures, the column of alcohol rises or falls in the glass thermometer. Which of the following best explains why the height of the alcohol column changes?\nAnswer:The alcohol expands more than the glass when heated.", "source": "arc_easy"}
{"text": "Question: An organism, such as a nematode worm, may have only 1000 cells. It should be classified as being\nAnswer:multicellular.", "source": "arc_easy"}
{"text": "Question: The Heliocentric Theory, as supported by Copernicus, revolutionized scientific theories regarding\nAnswer:the solar system.", "source": "arc_easy"}
{"text": "Question: Which process causes the leaves of a plant to become larger?\nAnswer:growth", "source": "arc_easy"}
{"text": "Question: Wind changes the surface of Earth. Which of these land formations is a result of transportation and deposition by wind?\nAnswer:a sand dune", "source": "arc_easy"}
{"text": "Question: Water moves by capillary action through soil from moist areas to dry areas. Which property of water is most responsible for this capillary action?\nAnswer:Water has a high surface tension.", "source": "arc_easy"}
{"text": "Question: Which action is the best method to separate a mixture of salt and water?\nAnswer:boiling the mixture until the water evaporates", "source": "arc_easy"}
{"text": "Question: In humans, a trait can be determined by one pair or many pairs of\nAnswer:genes", "source": "arc_easy"}
{"text": "Question: Which animal develops inside its mother before it is born alive?\nAnswer:Cat", "source": "arc_easy"}
{"text": "Question: Which sequence correctly shows the levels of organization for structure and function in a human?\nAnswer:cell -> tissue -> organ -> organ system", "source": "arc_easy"}
{"text": "Question: Which adaptation allows a fish to get oxygen underwater?\nAnswer:gills", "source": "arc_easy"}
{"text": "Question: The number of daylight hours in New York State changes with the\nAnswer:season of the year", "source": "arc_easy"}
{"text": "Question: Which instrument would be used when studying a unit on amphibian anatomy?\nAnswer:a dissecting kit", "source": "arc_easy"}
{"text": "Question: Which is a reason for Arkansas having multiple seasons?\nAnswer:the tilt of Earth's axis", "source": "arc_easy"}
{"text": "Question: Jessica watches the Sun set in the evening sky. What causes the setting of the Sun?\nAnswer:Earth is rotating on its axis.", "source": "arc_easy"}
{"text": "Question: To which planet do National Aeronautics and Space Administration (NASA) scientists hope to send humans next?\nAnswer:Mars", "source": "arc_easy"}
{"text": "Question: Which force keeps the planets in their orbits around the Sun?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: The endangered Florida manatee is a large, aquatic mammal that feeds on sea grasses in brackish water. Due to where they like to feed, manatees are vulnerable to injuries from boat propellers. If speed zones requiring boats to maintain a low speed are placed in areas where manatees are known to congregate, which will most likely occur?\nAnswer:manatee populations will increase", "source": "arc_easy"}
{"text": "Question: Which is an example of a different substance being formed?\nAnswer:wood burning", "source": "arc_easy"}
{"text": "Question: A mixture of powdered iron and sulfur is heated. What will be formed?\nAnswer:a compound", "source": "arc_easy"}
{"text": "Question: Scientists can identify an element by looking at the structure of a single\nAnswer:atom.", "source": "arc_easy"}
{"text": "Question: Newly made proteins are modified in which organelle?\nAnswer:endoplasmic reticulum", "source": "arc_easy"}
{"text": "Question: Which of the following is the primary advantage of sexual reproduction when compared to asexual reproduction?\nAnswer:There is greater genetic variety in offspring.", "source": "arc_easy"}
{"text": "Question: By attaching to sharks, remora fish eat the scraps of food left behind when the sharks feed. If remoras were not able to attach to sharks, they would most likely\nAnswer:not be able to survive.", "source": "arc_easy"}
{"text": "Question: Plants need a source of energy in order to perform photosynthesis. From which source do plants receive the energy needed to perform photosynthesis?\nAnswer:sunlight", "source": "arc_easy"}
{"text": "Question: What form of energy is stored in a battery?\nAnswer:chemical", "source": "arc_easy"}
{"text": "Question: When a light bulb is turned on, energy changes from one form to another. Which of the following best describes this change?\nAnswer:electrical energy to light energy", "source": "arc_easy"}
{"text": "Question: Which stimulus causes a porcupine to extend its quills?\nAnswer:threatening behavior by predators", "source": "arc_easy"}
{"text": "Question: When a balloon is filled with air and suddenly released, it will fly around the room as the air escapes. If compared to space transportation, the escaping air is most similar to what subsystem of a spacecraft?\nAnswer:propulsion", "source": "arc_easy"}
{"text": "Question: The Sun appears larger than other stars because of its\nAnswer:distance from Earth", "source": "arc_easy"}
{"text": "Question: How hot is it on the surface of the Sun?\nAnswer:Much hotter than almost anything on Earth", "source": "arc_easy"}
{"text": "Question: Which two observations are both used to describe weather?\nAnswer:temperature and sky conditions", "source": "arc_easy"}
{"text": "Question: A scientist combines oxygen and hydrogen to form water. This combination illustrates that water is\nAnswer:a compound.", "source": "arc_easy"}
{"text": "Question: In a large forest with many animals, there are only a small number of bears. Which of these most likely limits the population of bears in the forest?\nAnswer:supply of food", "source": "arc_easy"}
{"text": "Question: There is a thunderstorm close to your house. The windows rattle at the same time that you hear the thunder. What causes the windows to rattle?\nAnswer:Sound waves from the thunder", "source": "arc_easy"}
{"text": "Question: Rocks in warm and humid environments can be weathered faster than rocks in other environments. Which is most likely the next step in the rock cycle for weathered rocks?\nAnswer:They become eroded.", "source": "arc_easy"}
{"text": "Question: If the solar system were used as a model of an atom, what would the Sun most likely represent?\nAnswer:a nucleus", "source": "arc_easy"}
{"text": "Question: A student provides the following directions for brushing teeth: \u2022 Turn on the water. \u2022 Fill the glass with water and leave the water running. \u2022 Put toothpaste on the toothbrush. \u2022 Brush for two minutes. \u2022 Rinse mouth with the water from the glass. \u2022 Rinse the toothbrush with the running water. \u2022 Turn off the water. Which change in these directions would conserve the most water?\nAnswer:Turn the water off before brushing.", "source": "arc_easy"}
{"text": "Question: Which of these shows the correct order for the central dogma of molecular biology?\nAnswer:DNA to RNA to protein", "source": "arc_easy"}
{"text": "Question: Meiosis contributes to the process of reproduction by producing what type of cell?\nAnswer:haploid", "source": "arc_easy"}
{"text": "Question: The abundance of a mineral at the surface of Earth most likely depends upon the\nAnswer:types of elements available in the crust.", "source": "arc_easy"}
{"text": "Question: Which has the greatest effect on aiding the movement of blood through the human body?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: Why should scientists wear goggles during experiments?\nAnswer:to protect their eyes", "source": "arc_easy"}
{"text": "Question: Which of the following organisms produces energy from sunlight?\nAnswer:grass", "source": "arc_easy"}
{"text": "Question: Which statement is true for all objects?\nAnswer:All objects have mass.", "source": "arc_easy"}
{"text": "Question: Elements in the same column of the Periodic Table of the Elements all\nAnswer:have similar physical characteristics.", "source": "arc_easy"}
{"text": "Question: What is the main function of scales on a fish?\nAnswer:to protect the fish", "source": "arc_easy"}
{"text": "Question: Which invention made mass production possible?\nAnswer:the assembly line", "source": "arc_easy"}
{"text": "Question: What causes a meteoroid to glow as it falls through the atmosphere of Earth?\nAnswer:friction", "source": "arc_easy"}
{"text": "Question: The cheetah population around the world has decreased because of poaching and loss of habitat. The surviving population is found to have similar alleles. Which factor is endangering the species' survival the most?\nAnswer:shrinking of the gene pool", "source": "arc_easy"}
{"text": "Question: What is generated when the students count and record the number of organisms in the pond water?\nAnswer:data", "source": "arc_easy"}
{"text": "Question: The Mariana Trench is the deepest ocean trench on Earth. This trench occurs at a plate boundary where\nAnswer:one plate is being forced beneath another.", "source": "arc_easy"}
{"text": "Question: Students want to find out at which temperature bean plants grow tallest. Which science process skill would be used to find this temperature?\nAnswer:measuring", "source": "arc_easy"}
{"text": "Question: When would the highest tides occur along the Texas coast?\nAnswer:during a full moon", "source": "arc_easy"}
{"text": "Question: Sodium (Na) and chlorine (Cl) combine to form sodium chloride (NaCl), which is commonly known as\nAnswer:table salt.", "source": "arc_easy"}
{"text": "Question: It rained on a hot summer afternoon and a puddle formed. After several hours, the puddle was gone. Which two processes made the puddle form and then disappear?\nAnswer:precipitation followed by evaporation", "source": "arc_easy"}
{"text": "Question: Which environmental problem was directly caused by the invention of the automobile?\nAnswer:increase in air pollution", "source": "arc_easy"}
{"text": "Question: At some places in Florida, sand on the beaches is being reduced. New sand is brought from other areas and spread on the beaches. What process causes this reduction to the beach sand?\nAnswer:erosion", "source": "arc_easy"}
{"text": "Question: Which characteristic of a volvox colony makes it more like a multicellular organism than a simple cluster of unicellular organisms?\nAnswer:Some cells in the colony are specialized for reproduction.", "source": "arc_easy"}
{"text": "Question: Students are investigating which type of fruit attracts the most fruit flies. Equally sized pieces of ripe apple, peach, and banana are placed in separate containers. The containers allow fruit flies to enter, but the fruit flies are unable to escape. The containers are placed outside on a picnic table for two days. The most reliable method for collecting data is to count the number of fruit flies\nAnswer:on all three types of fruit every two hours", "source": "arc_easy"}
{"text": "Question: Malaria is a common disease in many countries. What is the cause of this disease?\nAnswer:a parasite", "source": "arc_easy"}
{"text": "Question: Mold is often found growing on old bread. In a food chain, mold is a ___.\nAnswer:decomposer", "source": "arc_easy"}
{"text": "Question: Which form of energy are x rays and ultraviolet light?\nAnswer:electromagnetic", "source": "arc_easy"}
{"text": "Question: Which of these geographic features most directly influences the climate of Nevada by limiting the amount of water vapor that can reach the state and fall as rain?\nAnswer:Sierra Nevada Mountains", "source": "arc_easy"}
{"text": "Question: Cells come in two basic types, prokaryotic and eukaryotic. Which cell structure is found in both prokaryotic and eukaryotic cells?\nAnswer:cytoplasm", "source": "arc_easy"}
{"text": "Question: From which part of the plant does a bee get food?\nAnswer:flower", "source": "arc_easy"}
{"text": "Question: As Earth revolves around the Sun, the number of daylight hours varies from place to place. In which location would the number of daylight hours remain constant?\nAnswer:Equator", "source": "arc_easy"}
{"text": "Question: Why does tapping a fork against a water glass produce a sound?\nAnswer:The particles in the objects vibrate.", "source": "arc_easy"}
{"text": "Question: A student places a sheet of black construction paper on her desk. What happens to most of the light that strikes the black construction paper?\nAnswer:The light is absorbed by the paper.", "source": "arc_easy"}
{"text": "Question: Which of these groups animals are ALL mammals?\nAnswer:mouse, monkey, bat", "source": "arc_easy"}
{"text": "Question: Which part of a plant cell is responsible for controlling the activities of the other parts of the cell?\nAnswer:Nucleus", "source": "arc_easy"}
{"text": "Question: All metabolic functions fall into one of two categories: a breaking down process (catabolic) or a building up process (anabolic). Which is an example of an anabolic process?\nAnswer:protein synthesis", "source": "arc_easy"}
{"text": "Question: Clearing forests of trees and vegetation for human development can have major impacts on the ecosystem. Which would most likely occur after a forested area is cleared?\nAnswer:an increase in soil erosion", "source": "arc_easy"}
{"text": "Question: Which of these is the most responsible for the changes of the seasons on Earth?\nAnswer:Tilt of Earth on its axis", "source": "arc_easy"}
{"text": "Question: Turning off the light when leaving a room is an example of\nAnswer:conserving energy.", "source": "arc_easy"}
{"text": "Question: Which list contains only things that are part of our solar system?\nAnswer:planets, moons, comets", "source": "arc_easy"}
{"text": "Question: A family installs a new heating system in their home. Which is the most desirable result of the new heating system?\nAnswer:decreasing the amount of energy used", "source": "arc_easy"}
{"text": "Question: The Andes Mountains in South America formed when an oceanic plate shifted beneath a continental plate. Which other landforms are usually associated with this type of plate boundary?\nAnswer:ocean trenches", "source": "arc_easy"}
{"text": "Question: Which of the following animals goes through metamorphosis?\nAnswer:frog", "source": "arc_easy"}
{"text": "Question: Which group of organisms can make food by a process called chemosynthesis?\nAnswer:producers", "source": "arc_easy"}
{"text": "Question: Which of these are broken down during chemical, but not physical, changes?\nAnswer:compounds", "source": "arc_easy"}
{"text": "Question: Fossils of clam shells were found in the Appalachian Mountains. Which of these statements best explains why the clam shells were found in the Appalachian Mountains?\nAnswer:The mountain range was once under water.", "source": "arc_easy"}
{"text": "Question: When a formula unit of magnesium sulfide, MgS, is separated into magnesium and sulfur particles, the particles are called\nAnswer:ions.", "source": "arc_easy"}
{"text": "Question: Which action is an example of an exothermic process?\nAnswer:making ice cubes", "source": "arc_easy"}
{"text": "Question: Which best explains why some reptiles and amphibians lay an abundance of eggs?\nAnswer:It increases the chance of some eggs surviving to hatch.", "source": "arc_easy"}
{"text": "Question: Which is the best example of recycling?\nAnswer:using aluminum cans to make new products", "source": "arc_easy"}
{"text": "Question: When two objects are touching, heat is transferred from the warmer object to the cooler one by\nAnswer:conduction.", "source": "arc_easy"}
{"text": "Question: Genes code for specifically structured\nAnswer:proteins.", "source": "arc_easy"}
{"text": "Question: What is the repeating monomer of a DNA molecule?\nAnswer:nucleotide", "source": "arc_easy"}
{"text": "Question: The range of all forms of radiant energy is called the\nAnswer:electromagnetic spectrum.", "source": "arc_easy"}
{"text": "Question: Which of the following is one reason that quartz is classified as a mineral?\nAnswer:It has a specific crystal structure.", "source": "arc_easy"}
{"text": "Question: Which of the following activities is the best example of instinctive behavior in an animal?\nAnswer:A newly hatched sea turtle walks toward the ocean.", "source": "arc_easy"}
{"text": "Question: If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live?\nAnswer:The population of deer will increase.", "source": "arc_easy"}
{"text": "Question: Which is a feedback mechanism the human body uses to maintain homeostasis?\nAnswer:perspiring to lower the body temperature", "source": "arc_easy"}
{"text": "Question: Changes to Earth's surface can happen slowly or quickly. Which of these changes happens the most quickly?\nAnswer:a storm moving a sandbar", "source": "arc_easy"}
{"text": "Question: What event happens in a daily cycle?\nAnswer:high and low tides", "source": "arc_easy"}
{"text": "Question: The burning of fossil fuels has added pollutants that contain sulfur atoms to the air. These pollutants have contributed to which of the following?\nAnswer:acid rain", "source": "arc_easy"}
{"text": "Question: A scientist was examining a large boulder that was covered with lichens (a combination of fungi and algae). He chipped a piece of the rock and placed it under a microscope. He observed that the surface of the rock was breaking down underneath the lichen. Which was the scientist most likely observing?\nAnswer:the effects of chemical weathering", "source": "arc_easy"}
{"text": "Question: Which organism belongs in the kingdom Protista?\nAnswer:paramecium", "source": "arc_easy"}
{"text": "Question: How is the structure of an atom best described?\nAnswer:a positive core surrounded by mostly empty space", "source": "arc_easy"}
{"text": "Question: What do producers need to make food?\nAnswer:sunlight, water, and carbon dioxide", "source": "arc_easy"}
{"text": "Question: Fish can live in lakes that are frozen because liquid water remains below the ice at the surface. Which of these describes a property of water that allows some liquid water to remain in frozen lakes?\nAnswer:Water is less dense as a solid than as a liquid.", "source": "arc_easy"}
{"text": "Question: A certain disease of the spinal cord can be passed on from a dog to its offspring. This disease can result in the dog's muscles becoming weak, leading to paralysis. This is an example of\nAnswer:an inherited disease.", "source": "arc_easy"}
{"text": "Question: Paula determines a property of a marble using a balance and a graduated cylinder. What property is Paula most likely determining by using both tools?\nAnswer:density", "source": "arc_easy"}
{"text": "Question: Why do satellites and spacecraft launched from Earth need to reach a specific speed to escape Earth's surface?\nAnswer:to overcome Earth's gravitational force", "source": "arc_easy"}
{"text": "Question: Which of these is a nonliving part of a forest?\nAnswer:Soil", "source": "arc_easy"}
{"text": "Question: Which change increases the rate of a chemical reaction?\nAnswer:increasing the reaction temperature", "source": "arc_easy"}
{"text": "Question: Which characteristic is found ONLY in mammals?\nAnswer:glands that make milk", "source": "arc_easy"}
{"text": "Question: The relationship between an owl and a mouse is a\nAnswer:predator-prey relationship.", "source": "arc_easy"}
{"text": "Question: The heart, veins, arteries, and capillaries make up which organ system?\nAnswer:circulatory", "source": "arc_easy"}
{"text": "Question: Some kinds of fish live most of their lives in salt water but lay their eggs in freshwater. Their ability to survive in different environments is an example of\nAnswer:adaptation", "source": "arc_easy"}
{"text": "Question: Which of the following statements applies to all states of matter?\nAnswer:Matter is made up of particles called atoms.", "source": "arc_easy"}
{"text": "Question: Which process in the water cycle returns water from the surface of Earth to the atmosphere?\nAnswer:evaporation", "source": "arc_easy"}
{"text": "Question: Which of the following organisms have the greatest effect on an ecosystem because of the changes they make to their environment?\nAnswer:beavers building a dam across a stream", "source": "arc_easy"}
{"text": "Question: Which inventor had the greatest impact on the development of artificial light?\nAnswer:Thomas Edison", "source": "arc_easy"}
{"text": "Question: Mounds and ridges in the Snake Range area of Nevada are composed of boulders, sand, and gravel. These landforms were most likely formed by\nAnswer:melting glaciers.", "source": "arc_easy"}
{"text": "Question: Noah studied different systems in the human body. Which best describes a function of veins in the circulatory system?\nAnswer:carrying blood from the body to the heart", "source": "arc_easy"}
{"text": "Question: A genetic mutation has caused the fur color of field mice to contrast with their environment. This type of mutation will most likely\nAnswer:harm the mice.", "source": "arc_easy"}
{"text": "Question: Ella has several wooden blocks. When Ella holds the blocks in her hand, she feels that they are rough. Which term best describes what Ella feels?\nAnswer:an observation", "source": "arc_easy"}
{"text": "Question: Which is most likely a cancer treatment?\nAnswer:a drug that kills only rapidly dividing cells", "source": "arc_easy"}
{"text": "Question: What happens to the physical state of water when it freezes?\nAnswer:expands", "source": "arc_easy"}
{"text": "Question: When electric current flows through the metal filament of a light bulb, electrical energy is converted to\nAnswer:heat and light energy.", "source": "arc_easy"}
{"text": "Question: At night, the Moon is the brightest object in the sky. Where does the Moon's light come from?\nAnswer:The Moon reflects light from the Sun.", "source": "arc_easy"}
{"text": "Question: Strong winds have the ability to uproot large trees in a wooded area. Which of these organisms would most likely benefit from this change in a habitat?\nAnswer:a plant that needs sunlight to grow", "source": "arc_easy"}
{"text": "Question: Residential construction is expanding in Florida. The expansion has caused fragmentation of habitats. One of the results of the increased construction is a decrease in the number of large predators such as the coyote, black bear, and panther. Which will be the most immediate local result of this fragmentation?\nAnswer:increase in population of prey species", "source": "arc_easy"}
{"text": "Question: Which of these resources is renewable?\nAnswer:wind", "source": "arc_easy"}
{"text": "Question: Which property of air does a barometer measure?\nAnswer:pressure", "source": "arc_easy"}
{"text": "Question: Which measurement represents the mass of an object?\nAnswer:35 grams", "source": "arc_easy"}
{"text": "Question: The primary function of insulin in our bodies is to\nAnswer:regulate the amount of glucose in the blood.", "source": "arc_easy"}
{"text": "Question: Which type of organism is the best at fixing nitrogen?\nAnswer:bacteria", "source": "arc_easy"}
{"text": "Question: A scientist studies how weathering and erosion can change the shape of a mountain. The scientist needs to collect information over what period of time to gather the most accurate information?\nAnswer:years", "source": "arc_easy"}
{"text": "Question: Many types of organisms live in a meadow. With the introduction of a large, swift-moving predator into the meadow ecosystem, which group of organisms will MOST likely have an advantage of surviving and reproducing?\nAnswer:rabbits that can run the fastest", "source": "arc_easy"}
{"text": "Question: The systems of the human body work together. Which system works with the skeletal system by pulling on the bones to create movement?\nAnswer:muscular", "source": "arc_easy"}
{"text": "Question: Scientists Stanley Miller and Harold Urey sealed water, methane, ammonia, and hydrogen in a flask, to simulate Earth's early environment. They exposed the chemicals to electric charges to simulate lighting. What did the process produce?\nAnswer:amino acids", "source": "arc_easy"}
{"text": "Question: Many birds fly south for the winter. This adaptation is called\nAnswer:migration", "source": "arc_easy"}
{"text": "Question: Air is made up of many gases. Which gas is found in the greatest amount?\nAnswer:Nitrogen", "source": "arc_easy"}
{"text": "Question: Biotic forces can cause changes to the surface of Earth. Which is the best example of living organisms causing weathering?\nAnswer:Tree seedlings growing and forming cracks in rocks.", "source": "arc_easy"}
{"text": "Question: The digestion process begins in which of the following?\nAnswer:mouth", "source": "arc_easy"}
{"text": "Question: Certain fossils can be used to help determine the age of the rock layer in which the fossils are found. Which type of fossil is best to use when making this determination?\nAnswer:index fossil", "source": "arc_easy"}
{"text": "Question: In pea plants, tall is dominant over short. What size pea plants will result when a pure tall plant is crossed with a pure short plant?\nAnswer:tall plants", "source": "arc_easy"}
{"text": "Question: One way animals usually respond to a sudden drop in temperature is by\nAnswer:shivering", "source": "arc_easy"}
{"text": "Question: The continental crust floats on top of the mantle because the crust is\nAnswer:less dense than the mantle.", "source": "arc_easy"}
{"text": "Question: Joanne wants to investigate factors that affect different patterns of the flight of bees. Which step in the scientific method must she follow before forming a hypothesis?\nAnswer:gather information about flight patterns", "source": "arc_easy"}
{"text": "Question: Which set contains kingdoms that contain only heterotrophs?\nAnswer:Animals, Fungi", "source": "arc_easy"}
{"text": "Question: Chromosomes contain the genetic information of an organism. Fruit flies reproduce by sexual reproduction. Most of the cells of a fruit fly have 8 chromosomes. Which statement best explains the source of the chromosomes in a normal fertilized fruit fly egg?\nAnswer:The sperm cell provides 4 chromosomes and the egg cell provides 4 chromosomes.", "source": "arc_easy"}
{"text": "Question: Which weather instrument measures air pressure?\nAnswer:barometer", "source": "arc_easy"}
{"text": "Question: A volcano under the ocean slowly releases lava over time. As the lava is released, it cools and hardens on the ocean floor. Which feature will most likely form from the release and cooling of the lava on the ocean floor over time?\nAnswer:an island", "source": "arc_easy"}
{"text": "Question: The main function of a duck's webbed feet is to help the duck\nAnswer:swim in water", "source": "arc_easy"}
{"text": "Question: Which is a quick process that can form new land near an ocean?\nAnswer:volcano erupting", "source": "arc_easy"}
{"text": "Question: Which of these features of Earth's crust are caused by the shifting of tectonic plates?\nAnswer:mid-ocean ridges", "source": "arc_easy"}
{"text": "Question: Which of the following helps the leaves break down after they have fallen off the tree?\nAnswer:decomposers", "source": "arc_easy"}
{"text": "Question: Where are proteins synthesized?\nAnswer:ribosomes", "source": "arc_easy"}
{"text": "Question: When compared to current average conditions, which term would best describe conditions in Earth's lower atmosphere if greenhouse gases were absent?\nAnswer:cooler", "source": "arc_easy"}
{"text": "Question: Plumes of water vapor have been observed rising from the southern polar region of Enceladus, one of the moons of Saturn. A team of scientists proposed an explanation for the plumes and developed a model. They also published calculations based on their model. These calculations would most likely be used for which purpose in future research?\nAnswer:evaluating similar events", "source": "arc_easy"}
{"text": "Question: If water gets into the crack of a rock and then freezes, the rock will MOST likely\nAnswer:break apart", "source": "arc_easy"}
{"text": "Question: Which organisms form the base of all ecosystems?\nAnswer:producers", "source": "arc_easy"}
{"text": "Question: Martin is writing a report for science class about how the tilt of Earth affects living organisms. Which subject should Martin include in his report that is directly affected by Earth's tilt?\nAnswer:changing of the seasons", "source": "arc_easy"}
{"text": "Question: In what way do transit systems, such as buses, benefit society?\nAnswer:by reducing the amount of pollution", "source": "arc_easy"}
{"text": "Question: Increased nutrient levels in lakes can cause ecological changes that result in the death of many fish. At what point in the hydrological cycle are most nutrients deposited into lakes?\nAnswer:runoff", "source": "arc_easy"}
{"text": "Question: Which of these cell parts contain instructions for the passage of traits from one generation to the next?\nAnswer:chromosomes", "source": "arc_easy"}
{"text": "Question: Which action causes a chemical change?\nAnswer:leaves being burned in a fire", "source": "arc_easy"}
{"text": "Question: Which type of organism would most likely benefit directly from increased levels of CO_{2}?\nAnswer:tree", "source": "arc_easy"}
{"text": "Question: When the lighted half of the Moon faces the Sun and the dark half faces Earth, the phase of the Moon viewed from Earth is called the\nAnswer:new moon.", "source": "arc_easy"}
{"text": "Question: The flower petals of a hydrangea plant change color as the acidity of the soil changes. The color changes are directly related to which factor?\nAnswer:environmental conditions", "source": "arc_easy"}
{"text": "Question: What is significant about the discovery of water on Mars?\nAnswer:It provides evidence there may be life on Mars.", "source": "arc_easy"}
{"text": "Question: A teacher places an item in a box. The item takes the shape of the entire container. This item is most likely\nAnswer:air.", "source": "arc_easy"}
{"text": "Question: In New York State, the shortest period of daylight occurs during which month?\nAnswer:December", "source": "arc_easy"}
{"text": "Question: During which of the processes below does water vapor change to liquid water?\nAnswer:condensation", "source": "arc_easy"}
{"text": "Question: Which technological advancement has done the most to improve the accuracy of weather predictions?\nAnswer:satellites", "source": "arc_easy"}
{"text": "Question: An important rule for students to know when heating a test tube is to\nAnswer:point the mouth of the test tube away from others.", "source": "arc_easy"}
{"text": "Question: How would a drought most likely affect the plants of a grassy plain?\nAnswer:There would be shorter plants.", "source": "arc_easy"}
{"text": "Question: The brain and spinal cord are parts of which body system?\nAnswer:nervous", "source": "arc_easy"}
{"text": "Question: Chromosome mutations involve the deletion or duplication of many genes. The effects of chromosome mutations are often much greater than mutations within a single gene, because chromosome mutations\nAnswer:can cause abnormal development of the offspring.", "source": "arc_easy"}
{"text": "Question: What will most likely result when the jet stream moves south of North Carolina?\nAnswer:North Carolina will experience cold weather.", "source": "arc_easy"}
{"text": "Question: Estuaries in Florida often have mangrove trees growing in them. The roots of the mangrove trees slow the flow of the water, which allows soil particles to settle. If people were allowed to remove the mangrove trees, how would the estuary environment most likely be affected?\nAnswer:The amounts of nutrients in the water would decrease.", "source": "arc_easy"}
{"text": "Question: Which sense can be used to determine an object's ability to reflect light?\nAnswer:sight", "source": "arc_easy"}
{"text": "Question: The North America Nebula is named for its similarity in shape to the North American continent. It was discovered within the Milky Way by astronomer William Herschel in 1790. What was Mr. Herschel most likely observing?\nAnswer:a cloud of hydrogen gas and dust where stars are born", "source": "arc_easy"}
{"text": "Question: Which animals are most likely to carry the seeds found in berries from the parent plant to another area?\nAnswer:birds", "source": "arc_easy"}
{"text": "Question: All rocks are composed of\nAnswer:minerals", "source": "arc_easy"}
{"text": "Question: In some dry areas, large amounts of water have been pumped from underground sources where water has been naturally stored for thousands of years. If the water is not replaced, what type of land feature is most likely to result?\nAnswer:desert", "source": "arc_easy"}
{"text": "Question: Which scientist studied biology by traveling by ship to different islands observing animal life, and developed a hypothesis about how species change?\nAnswer:Charles Darwin", "source": "arc_easy"}
{"text": "Question: How does a student best avoid becoming dehydrated during a field investigation on a hot day?\nAnswer:drink water from a bottle", "source": "arc_easy"}
{"text": "Question: The primary function of a doorbell circuit is to convert electrical energy into\nAnswer:sound.", "source": "arc_easy"}
{"text": "Question: A lunar eclipse occurs when the Moon passes through Earth's shadow. A lunar eclipse can only occur during a\nAnswer:full moon.", "source": "arc_easy"}
{"text": "Question: A recent study concluded that about 90% of all large predatory fish such as tuna have disappeared from the world's oceans in the past 50 years. Which of these is most likely the direct cause of this loss?\nAnswer:Commercial harvesting from the ocean", "source": "arc_easy"}
{"text": "Question: When an ice cube melts, its state of matter changes from a\nAnswer:solid to a liquid", "source": "arc_easy"}
{"text": "Question: In which way are evaporation and condensation similar?\nAnswer:Both are caused by changes in heat energy.", "source": "arc_easy"}
{"text": "Question: The surface of a heated metal object measures 120\u00b0C. It is dropped into a bucket filled with water measuring 10\u00b0C. Which of the following is most likely to occur?\nAnswer:The water and metal will adjust to the same temperature between 10\u00b0C and 120\u00b0C.", "source": "arc_easy"}
{"text": "Question: In order to record the passing of a distant comet, which instruments would be the most useful?\nAnswer:telescope with camera attachment and camera", "source": "arc_easy"}
{"text": "Question: Temperature is the measurement of which type of energy?\nAnswer:kinetic", "source": "arc_easy"}
{"text": "Question: Scientists are discovering ways to make some crops use less water. A person working in which job would most benefit from this research?\nAnswer:a farmer", "source": "arc_easy"}
{"text": "Question: Stem cells are cells that can differentiate into many different kinds of cells. Scientists have discovered that the environment supporting the cells influences stem-cell differentiation. For example, stem cells grown on strong, flexible surfaces became muscle cells. What most likely happened to stem cells grown on a hard, rigid surface?\nAnswer:They became bone cells.", "source": "arc_easy"}
{"text": "Question: Sherry is going to use her computer to draw a three-dimensional box. She wants to be able to specify the exact dimensions and angles and to rotate the box as needed on the screen. Which of the following types of programs would Sherry most likely use for this purpose?\nAnswer:computer-aided design program", "source": "arc_easy"}
{"text": "Question: Scientists who have studied the hydrosphere concluded that about 71% of Earth is covered with water. Which part of the hydrosphere is most often associated with the formation of organic rocks?\nAnswer:oceans", "source": "arc_easy"}
{"text": "Question: Which property of proteins best allows them to perform an enormously diverse range of functions?\nAnswer:the complexity of their folded structure", "source": "arc_easy"}
{"text": "Question: The mathematical model for calculating speed is shown below. Speed = distance/time. An airplane traveled 700 kilometers in two hours during a trip. What was the average speed of the plane during the trip?\nAnswer:350 kilometers per hour", "source": "arc_easy"}
{"text": "Question: What is the best way for a marine scientist to determine the eating habits of sharks?\nAnswer:Tag several sharks and monitor their eating habits for one year.", "source": "arc_easy"}
{"text": "Question: A student pushes a wooden block across a sheet of sandpaper. Which characteristic of the block increases?\nAnswer:temperature", "source": "arc_easy"}
{"text": "Question: Amanda is learning about different adaptations of animals. Which is an example of a behavioral adaptation?\nAnswer:migration of songbirds", "source": "arc_easy"}
{"text": "Question: Which of the following is the best example of a custom-made product?\nAnswer:artificial leg", "source": "arc_easy"}
{"text": "Question: Michelle is interested in improving the quality of the soil in her yard. She wants more water and air to penetrate the soil. What should she add to the soil to help her achieve this goal?\nAnswer:earthworms", "source": "arc_easy"}
{"text": "Question: Which of these could cause water vapor to condense into rain droplets?\nAnswer:air rising into colder regions of the atmosphere", "source": "arc_easy"}
{"text": "Question: The human body processes and eliminates food waste using the organs of the excretory system. Which organelle performs a similar function in humans at the cellular level?\nAnswer:lysosome", "source": "arc_easy"}
{"text": "Question: What causes the most soil and rock erosion?\nAnswer:water", "source": "arc_easy"}
{"text": "Question: The theory of continental drift states that the land masses called continents were once closer together and have drifted apart over time. Which circumstance is the strongest evidence in support of this theory?\nAnswer:the similarity of fossils on different continents", "source": "arc_easy"}
{"text": "Question: Rich beds of marine fossils have been found in Florida. By dating these fossils, scientists can best determine\nAnswer:the period during which Florida was covered in water.", "source": "arc_easy"}
{"text": "Question: In the forest, one type of tree produces special seeds. These seeds start to grow only after going through a fire. In the fire, the adult trees are destroyed. Which resources, needed for growth, are now available to the newly growing seeds?\nAnswer:sunlight and space", "source": "arc_easy"}
{"text": "Question: Which is an example of a decomposer?\nAnswer:a mushroom", "source": "arc_easy"}
{"text": "Question: In the lab, students are working with substances that could cause burns. Which of these safety precautions is most important to follow?\nAnswer:Eye protection is worn.", "source": "arc_easy"}
{"text": "Question: Which process moves an ion across a cell membrane against the concentration gradient?\nAnswer:active transport", "source": "arc_easy"}
{"text": "Question: Which would most likely be the characteristic of an object with a small volume and large mass?\nAnswer:high density", "source": "arc_easy"}
{"text": "Question: Which of these describes a small range in the electromagnetic spectrum?\nAnswer:light", "source": "arc_easy"}
{"text": "Question: An idea that the universe originated with an explosion is supported by repeated observations of light from distant galaxies traveling away from Earth. An idea that has been tested repeatedly and is supported by repeated results is most likely a\nAnswer:theory.", "source": "arc_easy"}
{"text": "Question: Natural selection cannot occur without\nAnswer:genetic variation in species.", "source": "arc_easy"}
{"text": "Question: In which of these investigations would pictures from a camera be most useful?\nAnswer:studying the growth of plants", "source": "arc_easy"}
{"text": "Question: Of the examples listed, which event is thought by scientists to have led to the greatest extinction?\nAnswer:whalers of the 17th, 18th, and 19th centuries", "source": "arc_easy"}
{"text": "Question: The human stomach is protected from self-digestion by a layer of\nAnswer:mucus.", "source": "arc_easy"}
{"text": "Question: On a field trip, a student holds a frog and reports that it has slippery skin. This is an example of\nAnswer:an observation", "source": "arc_easy"}
{"text": "Question: What most likely happens to soil when crops are not rotated from year to year?\nAnswer:The soil nutrients are depleted.", "source": "arc_easy"}
{"text": "Question: Materials must pass through a cell's semi-permeable membrane in order for energy to be utilized. This process is called\nAnswer:diffusion.", "source": "arc_easy"}
{"text": "Question: What is a decomposer?\nAnswer:a living thing that breaks down dead organisms", "source": "arc_easy"}
{"text": "Question: Modern technology has had some positive and negative effects on society. Which would be a negative effect of advances in technology?\nAnswer:human jobs replaced by more efficient machines", "source": "arc_easy"}
{"text": "Question: Which of the following allows a cell to become specialized?\nAnswer:different patterns of gene expression", "source": "arc_easy"}
{"text": "Question: Which tool would be best to use for counting the number of legs on an ant?\nAnswer:hand lens", "source": "arc_easy"}
{"text": "Question: A dragonfly develops through incomplete metamorphosis. Which stages does the dragonfly's life cycle include?\nAnswer:egg and nymph", "source": "arc_easy"}
{"text": "Question: When a cold front moves over a land region that has warm, moist air, a transfer of energy occurs. Cold air sinks and pushes warmer air upward. As energy is removed from the air, which change will most likely take place?\nAnswer:Water in the atmosphere will undergo a phase change.", "source": "arc_easy"}
{"text": "Question: Which sequence lists the levels of organization in the human body from simplest to most complex?\nAnswer:cell -> tissue -> organ -> organ system", "source": "arc_easy"}
{"text": "Question: Cancer is best described as\nAnswer:abnormal cell division", "source": "arc_easy"}
{"text": "Question: To pump blood through the body, the heart must overcome the force of gravity. Which body position would require the least work from the heart?\nAnswer:lying down", "source": "arc_easy"}
{"text": "Question: In order to grow two of the exact same plants, a person would reproduce them asexually because the\nAnswer:offspring would be genetically identical.", "source": "arc_easy"}
{"text": "Question: In flowering plants, what structure containing DNA is transported from one plant to another?\nAnswer:pollen", "source": "arc_easy"}
{"text": "Question: Several interchangeable parts are used in the manufacture of automobiles. Some examples of these parts are batteries, windshield wiper blades, spark plugs, and tires. Which of the following is an advantage of interchangeable parts over non-interchangeable parts on automobiles?\nAnswer:Interchangeable parts can fit many kinds of automobiles.", "source": "arc_easy"}
{"text": "Question: Which of the following represents a chemical reaction?\nAnswer:a cake baking in an oven.", "source": "arc_easy"}
{"text": "Question: When a hammer strikes a nail, the nail\nAnswer:exerts an equal and opposite force back on the hammer.", "source": "arc_easy"}
{"text": "Question: Which of these natural events occurs at time intervals that are the most regular?\nAnswer:high tides and low tides", "source": "arc_easy"}
{"text": "Question: A student combined rice cereal with melted marshmallows. Which best describes what the student made?\nAnswer:a mixture", "source": "arc_easy"}
{"text": "Question: Brittany pedaled her bicycle quickly on a level surface. When she stopped pedaling and coasted, the bicycle slowed and came to a stop. What happened to the energy of the moving bicycle as it coasted to a stop?\nAnswer:It was transferred to heat due to friction.", "source": "arc_easy"}
{"text": "Question: Homes that are built to be environmentally friendly because they use energy more efficiently than other homes are called \"green\" homes. \"Green\" homes often have reflective roofs and walls made of recycled materials. The windows in these energy-saving homes are double-paned, meaning each window has two pieces of glass. Double-paned windows have a layer of air between the window panes. This layer is a barrier against extreme temperatures and saves energy. A solar panel on a \"green\" home uses\nAnswer:a renewable energy source", "source": "arc_easy"}
{"text": "Question: Which process occurs when rocks and soil slide down a mountain?\nAnswer:erosion", "source": "arc_easy"}
{"text": "Question: Tony is studying ladybugs in a garden. Which of these would BEST help Tony to count the spots on a ladybug?\nAnswer:Magnifying glass", "source": "arc_easy"}
{"text": "Question: Which is a physical property of an apple?\nAnswer:what color it is", "source": "arc_easy"}
{"text": "Question: Repeated pesticide use on an insect population can result in some of the insects becoming resistant to that pesticide over time. Which process is responsible for the pesticides no longer being effective on the insects?\nAnswer:natural selection", "source": "arc_easy"}
{"text": "Question: A boy pulls a sweater off over his head. His hair is attracted to the sweater due to\nAnswer:an electrical charge", "source": "arc_easy"}
{"text": "Question: In some communities, forests are cleared through burning, and the deforested land is used for farming. Which of these is a negative consequence of this practice?\nAnswer:decreased plant and animal diversity", "source": "arc_easy"}
{"text": "Question: Some plant cells are coated in a waxy layer that prevents water loss. This specialization is found in which plant cells?\nAnswer:cells on the plant surface", "source": "arc_easy"}
{"text": "Question: Scientists recorded the hourly temperature at a weather station for the month of July and want to quickly measure a trend over time in temperature changes. Which of these formats would be the most appropriate representation of the temperature data to quickly measure any trend?\nAnswer:line graph", "source": "arc_easy"}
{"text": "Question: A factory in Japan had been dumping mercury into Minamata Bay. Certain microorganisms in the water were able to change the mercury into a form that the plankton could use. Which most likely happened next?\nAnswer:The mercury passed through the food chain.", "source": "arc_easy"}
{"text": "Question: Students conducted an investigation with green bananas. They hypothesized that an onion placed near a banana could increase the rate at which the banana ripened. They placed one onion and one banana in each of three containers. In a fourth container they placed a banana, but no onion. Which statement best explains why the onion was left out of the fourth container?\nAnswer:The container without the onion is the control.", "source": "arc_easy"}
{"text": "Question: When cold weather freezes water in the cracks of rocks, which would most likely happen?\nAnswer:The rocks would break into smaller pieces.", "source": "arc_easy"}
{"text": "Question: What would best regulate the temperature of an overheated body?\nAnswer:a dilation of blood vessels in the skin", "source": "arc_easy"}
{"text": "Question: The surface of Earth is constantly changing. Which of these findings provides the best evidence that the crustal surface of Earth has changed over time?\nAnswer:Marine fossils are found in mountain areas.", "source": "arc_easy"}
{"text": "Question: Solar radiation is a combination of light with different wavelengths. Which type of ray can harm human skin the most?\nAnswer:ultraviolet", "source": "arc_easy"}
{"text": "Question: Water is often put through a treatment system before it is used in homes as drinking water. Which is the most likely reason water is treated before people drink it?\nAnswer:to remove harmful substances", "source": "arc_easy"}
{"text": "Question: How can plants most likely improve air quality?\nAnswer:by producing oxygen", "source": "arc_easy"}
{"text": "Question: A condition in bees called \"colony collapse disorder\" occurs when worker bees leave the hive to collect nectar and never return. How would a decline in the bee population most likely affect a farm ecosystem?\nAnswer:There would be a decline in fruit production.", "source": "arc_easy"}
{"text": "Question: How are animals that prey on other animals classified?\nAnswer:carnivores", "source": "arc_easy"}
{"text": "Question: Which process will separate the sugar from a mixture of sugar and water?\nAnswer:Evaporating the water", "source": "arc_easy"}
{"text": "Question: Which movement of carbon between reservoirs takes the longest to achieve?\nAnswer:from plant tissues to coal in the crust", "source": "arc_easy"}
{"text": "Question: Which types of objects are most easily seen by the human eye?\nAnswer:objects that reflect most of the light that strikes them", "source": "arc_easy"}
{"text": "Question: Planting legumes in order to add nitrogen to soil most likely causes\nAnswer:an enrichment in the fertility of the soil.", "source": "arc_easy"}
{"text": "Question: Earth is about 81 times more massive than the Moon. How will the mass and weight of a rocket on the Moon compare to its mass and weight on Earth?\nAnswer:The mass will be the same, but its weight will be less on the Moon.", "source": "arc_easy"}
{"text": "Question: Louis Pasteur discovered a process that allows milk to be stored in sealed containers for long periods of time without spoiling. The process, called pasteurization, involves heating the milk before placing it in the sealed containers.Which is the best explanation of how pasteurization works?\nAnswer:Heat killed microorganisms that could cause spoiling.", "source": "arc_easy"}
{"text": "Question: Which characteristic would best help a land animal survive in a cold Arctic climate?\nAnswer:thick fur", "source": "arc_easy"}
{"text": "Question: What is the most reasonable explanation for why a toy car rolls farther on a wood floor than on a thick carpet?\nAnswer:The carpet has more resistance.", "source": "arc_easy"}
{"text": "Question: What part of the scientific method involves measuring the growth of a plant over a one-month period?\nAnswer:observation", "source": "arc_easy"}
{"text": "Question: Which statement on a toothpaste package best supports the claim of fighting cavities?\nAnswer:certified by the American Dental Association", "source": "arc_easy"}
{"text": "Question: Which is a chemical compound?\nAnswer:sodium chloride", "source": "arc_easy"}
{"text": "Question: Which of these human activities in a forest has a positive effect on the ecosystem?\nAnswer:Planting new trees where old ones were cut down", "source": "arc_easy"}
{"text": "Question: Which is an example of water condensing?\nAnswer:Dew forming on plants during a cold night", "source": "arc_easy"}
{"text": "Question: Gregor Mendel studied ratios related to traits passed from parent pea plants to offspring pea plants. Mendel used large numbers of plants to avoid \"sampling error.\" This changed the way scientists studied genetics because it included ideas of\nAnswer:mathematics and probability.", "source": "arc_easy"}
{"text": "Question: What season is the Northern Hemisphere experiencing when it is tilted directly toward the Sun?\nAnswer:summer", "source": "arc_easy"}
{"text": "Question: Which species have been on the Earth for the shortest amount of time?\nAnswer:Humans", "source": "arc_easy"}
{"text": "Question: Which tool should be used to compare the growth of an algal colony growing in a petri dish?\nAnswer:a hand lens", "source": "arc_easy"}
{"text": "Question: Use The Periodic Table of the Elements and the information below to answer the question. Magnesium metal (Mg) is grayish-white in color and reacts actively with water. Fluorine (F2) is a greenish-yellow gas at room temperature and is a member of the halogen family. These two elements react to produce magnesium fluoride (MgF2), a chemical commonly used in making windows and lenses. How do the elements magnesium (Mg) and fluorine (F2) produce the compound magnesium fluoride (MgF2)?\nAnswer:by chemically combining", "source": "arc_easy"}
{"text": "Question: Male barn swallow birds with symmetrically-shaped wings find mates more quickly than males with asymmetrical wing shapes. Which statement best explains the significance of symmetry in the barn swallow population?\nAnswer:Symmetrical wings are attractive to females.", "source": "arc_easy"}
{"text": "Question: Which of the following would be most useful for calculating the density of a rock sample?\nAnswer:graduated cylinder and balance", "source": "arc_easy"}
{"text": "Question: Which object in our solar system reflects light and is a satellite that orbits around one planet?\nAnswer:the Moon", "source": "arc_easy"}
{"text": "Question: Students stir salt, sand, sawdust, and seashells into a jar filled with water. Which of the materials will form a solution?\nAnswer:salt and water", "source": "arc_easy"}
{"text": "Question: Which scale is used to report the intensity of an earthquake?\nAnswer:Modified Mercalli Scale", "source": "arc_easy"}
{"text": "Question: What is the outermost structure in a plant cell?\nAnswer:cell wall", "source": "arc_easy"}
{"text": "Question: The main source of food for a coyote population in one area is mice. Which is most likely to happen to these coyotes if a new predator begins eating the mice?\nAnswer:There will be fewer coyotes.", "source": "arc_easy"}
{"text": "Question: The best example of heat transfer by convection is when\nAnswer:heat rises in a chimney.", "source": "arc_easy"}
{"text": "Question: A worker needs to load a heavy box onto a truck. The worker uses a ramp to move the box because the ramp\nAnswer:reduces the amount of force applied to the box.", "source": "arc_easy"}
{"text": "Question: A fox grows thicker fur as a season changes. This adaptation helps the fox to\nAnswer:keep warmer", "source": "arc_easy"}
{"text": "Question: What is the main source of raw material for the production of plastics?\nAnswer:petroleum", "source": "arc_easy"}
{"text": "Question: The students in an engineering class built a robot that stacks wooden blocks. A built-in computer controls the movement of the robot. The computer in the robot performs a function most similar to which part of the human body?\nAnswer:brain", "source": "arc_easy"}
{"text": "Question: When sugar is heated on a hot plate, it turns into a liquid. When the liquid sugar is cooled, a hard-crystalline substance is formed. This model best demonstrates the formation of\nAnswer:igneous rocks.", "source": "arc_easy"}
{"text": "Question: Which distance is the smallest for which it is most practical to use the light-year as a unit of measurement?\nAnswer:the distance between the Sun and the center of the Milky Way", "source": "arc_easy"}
{"text": "Question: Which of the following devices relies on electromagnetic radiation in the radio wave region of the spectrum for operation?\nAnswer:cellular telephone", "source": "arc_easy"}
{"text": "Question: When a tree suffers from a decreased ability to transport materials within the phloem, what is directly impacted?\nAnswer:flow of necessary nutrients", "source": "arc_easy"}
{"text": "Question: Strontium, barium, and radium are grouped together on the Periodic Table of the Elements because they all have\nAnswer:similar electron configurations.", "source": "arc_easy"}
{"text": "Question: An example of a poor health habit is\nAnswer:eating candy instead of lunch", "source": "arc_easy"}
{"text": "Question: What type of inheritance controls blood types in humans?\nAnswer:multiple alleles", "source": "arc_easy"}
{"text": "Question: Minerals can be identified using hardness, streak, and cleavage because\nAnswer:minerals have different recognizable properties.", "source": "arc_easy"}
{"text": "Question: What is the process that produces energy in the Sun for billions of years?\nAnswer:fusion", "source": "arc_easy"}
{"text": "Question: Which statement is an opinion?\nAnswer:Life Science is a subject filled with interesting information.", "source": "arc_easy"}
{"text": "Question: Decomposers are organisms that obtain their food from dead organisms. Which of these would be classified as decomposers?\nAnswer:bacteria, fungi", "source": "arc_easy"}
{"text": "Question: DNA molecules contain the genetic information that determines the characteristics of a living organism. How do DNA molecules express the genetic information they contain?\nAnswer:by directing the process of protein synthesis", "source": "arc_easy"}
{"text": "Question: Fossil fuels were formed from\nAnswer:the remains of living things", "source": "arc_easy"}
{"text": "Question: Which of the following remains constant in Earth's carbon cycle?\nAnswer:the total mass of available carbon", "source": "arc_easy"}
{"text": "Question: Which invention has technology that helps people keep food fresh for a long period of time?\nAnswer:refrigerator", "source": "arc_easy"}
{"text": "Question: A student is designing a model of the solar system and writing a report. She is trying to be as accurate as possible. Which statement should she include in her report?\nAnswer:The orbit of Mars is similar to the orbit of Saturn.", "source": "arc_easy"}
{"text": "Question: Stacey picks apples and puts them in a basket. When she puts her basket on a scale, the scale reads two kilograms (kg). What property is Stacey measuring?\nAnswer:weight", "source": "arc_easy"}
{"text": "Question: Which feature is a physical property of copper?\nAnswer:conducts electricity", "source": "arc_easy"}
{"text": "Question: Which term describes Earth's orbit around the Sun?\nAnswer:revolution", "source": "arc_easy"}
{"text": "Question: How do the waxy stem covering and needle-shaped leaves improve the ability of a cactus to survive in the desert?\nAnswer:They reduce the loss of water from the plant to the air.", "source": "arc_easy"}
{"text": "Question: Which characteristic of a cell membrane allows it to control materials entering and leaving a cell?\nAnswer:A cell membrane is semipermeable.", "source": "arc_easy"}
{"text": "Question: Which statement about all living organisms is true?\nAnswer:They have at least one cell.", "source": "arc_easy"}
{"text": "Question: The length of daylight changes as the seasons change during the year. What causes these changes in daylight?\nAnswer:Earth's tilt on its axis", "source": "arc_easy"}
{"text": "Question: The populations of black rhinoceroses have been impacted by human interactions to the point of being endangered. Which interaction best explains why the black rhino is now endangered?\nAnswer:over hunting", "source": "arc_easy"}
{"text": "Question: A student had a cup of ice while working outside. After a while, the ice melted because the Sun emits energy in the form of light and\nAnswer:heat.", "source": "arc_easy"}
{"text": "Question: What characteristic of viruses distinguishes them from cells?\nAnswer:They lack an independent metabolism.", "source": "arc_easy"}
{"text": "Question: The energy required to lift an object is supplied by ATP derived from the breakdown of molecules of\nAnswer:glucose.", "source": "arc_easy"}
{"text": "Question: Living cells synthesize long chains of amino acids called proteins. Which substance provides the information needed to correctly sequence the amino acids during protein synthesis?\nAnswer:DNA", "source": "arc_easy"}
{"text": "Question: Which of these makes it possible for hurricanes to form?\nAnswer:water temperature", "source": "arc_easy"}
{"text": "Question: Most types of cacti survive the dry conditions of a desert because they hold water in their stems. This is an example of\nAnswer:an adaptation.", "source": "arc_easy"}
{"text": "Question: High-altitude cirrus clouds are primarily formed from which substance?\nAnswer:solid ice crystals", "source": "arc_easy"}
{"text": "Question: During a lab investigation a scientist heats a solid substance. The scientist observes that the solid has two different melting points. The scientist is able to separate the two resulting liquids. Which statement best classifies the original solid substance?\nAnswer:It was a mixture.", "source": "arc_easy"}
{"text": "Question: Over a long period of time, some flowering plants have become dependent on honey bees to fertilize their seeds. In recent years, a form of mite has infected and killed the honey bees in many areas of the country. Since this has happened, the once bee-dependent plants with the best chance of surviving are those that\nAnswer:have always attracted many other insects as well as honey bees.", "source": "arc_easy"}
{"text": "Question: Which landforms are most like hills but are much taller?\nAnswer:mountains", "source": "arc_easy"}
{"text": "Question: What is the basic unit of life?\nAnswer:cell", "source": "arc_easy"}
{"text": "Question: About how many Earth days does it take the Moon to travel around Earth?\nAnswer:27", "source": "arc_easy"}
{"text": "Question: Students studying the atmosphere want to display the percentage of each greenhouse gas as compared to the total amount of greenhouse gases found in the atmosphere. Which representation would be most appropriate for displaying these percentages?\nAnswer:pie chart", "source": "arc_easy"}
{"text": "Question: The Himalayan Mountain chain is the youngest and tallest mountain chain on Earth. Which phenomenon contributed most to this area of continental buildup?\nAnswer:convergence of continental plates", "source": "arc_easy"}
{"text": "Question: A large cold front is moving past the school on a hot, humid summer day. Which best describes the type of weather as the cold front passes by?\nAnswer:A thunderstorm", "source": "arc_easy"}
{"text": "Question: Growth and repair in multicellular organisms are the result of\nAnswer:cell division", "source": "arc_easy"}
{"text": "Question: A girl signals her friend by shining a flashlight on a mirror. Her friend can see the signal because\nAnswer:light energy can be reflected from one object to another", "source": "arc_easy"}
{"text": "Question: If a wooded area is cleared and corn is planted, what will MOST likely happen?\nAnswer:Animal habitats will be destroyed.", "source": "arc_easy"}
{"text": "Question: Warm water contains less dissolved oxygen than colder water. Which population will be most affected by a long period of hot, dry days?\nAnswer:fish in ponds", "source": "arc_easy"}
{"text": "Question: Which of the following is most responsible for the decay of dead organisms?\nAnswer:microorganisms", "source": "arc_easy"}
{"text": "Question: When a book is dropped onto a wooden desk, the molecules in the wood begin to vibrate from the force of the book. Which of these is produced by the vibrations?\nAnswer:sound waves", "source": "arc_easy"}
{"text": "Question: In 1976, the Viking I Lander was sent to Mars to analyze atmospheric gases and soil samples. The Viking I Lander was most likely a\nAnswer:space probe.", "source": "arc_easy"}
{"text": "Question: Which action forms a different chemical substance?\nAnswer:burning a piece of wood", "source": "arc_easy"}
{"text": "Question: Why do dogs have most of the characteristics of their parents?\nAnswer:They inherit them from their parents.", "source": "arc_easy"}
{"text": "Question: Which describes a specific characteristic necessary for survival in the desert?\nAnswer:conserving water", "source": "arc_easy"}
{"text": "Question: Frogs lay eggs that develop into tadpoles and then into adult frogs. This sequence of changes is an example of how living things\nAnswer:go through a life cycle", "source": "arc_easy"}
{"text": "Question: Quartz and feldspar are two common minerals. When they are found mixed together in nature they form\nAnswer:rocks.", "source": "arc_easy"}
{"text": "Question: Atoms of which of these elements are part of many organic molecules?\nAnswer:oxygen", "source": "arc_easy"}
{"text": "Question: Which object is the best conductor of electricity?\nAnswer:metal fork", "source": "arc_easy"}
{"text": "Question: An element with which property would be best to use in electrical wiring?\nAnswer:conductor", "source": "arc_easy"}
{"text": "Question: A large rock breaks into small pieces within 10 years. Which process is most likely responsible for breaking the large rock into small pieces within 10 years?\nAnswer:water repeatedly freezing and thawing in a crack", "source": "arc_easy"}
{"text": "Question: Paco throws a ball. What force pulls the ball down toward the ground?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: Which is a unit of measure for length?\nAnswer:meters", "source": "arc_easy"}
{"text": "Question: Movement of Earth's crust along plate boundaries produces\nAnswer:earthquakes", "source": "arc_easy"}
{"text": "Question: The praying mantis is well camouflaged in its natural habitat. What is a benefit of this adaptation?\nAnswer:It reduces the risk of being eaten by a predator.", "source": "arc_easy"}
{"text": "Question: The Greek philosopher Aristotle described matter with the phrase \"unable to be divided.\" The modern concept that grew from Aristotle's idea is the\nAnswer:atom.", "source": "arc_easy"}
{"text": "Question: Paleontologists often find and study the remains of ancient plants and animals. When the remains of ancient plants and animals are covered by layers of sediment over time, the remains\nAnswer:become a fossil", "source": "arc_easy"}
{"text": "Question: What are the basic structural units of living organisms?\nAnswer:cells", "source": "arc_easy"}
{"text": "Question: A student is visiting a local limestone quarry and finds fossils of seashells. The quarry is located hundreds of miles from the ocean. The fossils best indicate that\nAnswer:this area was once below sea level.", "source": "arc_easy"}
{"text": "Question: What happens to metal railroad tracks during the heat of a summer day?\nAnswer:increase in length", "source": "arc_easy"}
{"text": "Question: Jake is testing how light affects plant growth. He grows two plants in identical pots with the same amount of water and fertilizer. Jake grows one of the plants in the sun, and the other in the shade. Which part of Jake's process indicates that there is a control for this investigation?\nAnswer:He is growing one plant out of the sun.", "source": "arc_easy"}
{"text": "Question: Which stage of a frog's life cycle can be compared to a plant seed growing into a new plant?\nAnswer:when frog eggs hatch into tadpoles", "source": "arc_easy"}
{"text": "Question: Which of these elements is likely to be found in an organic compound?\nAnswer:hydrogen", "source": "arc_easy"}
{"text": "Question: What statement describes what happens to the carbon dioxide waste produced by a developing baby during pregnancy?\nAnswer:It is carried by the umbilical cord to the placenta and then to the mother's blood.", "source": "arc_easy"}
{"text": "Question: Which part of the atom has a negative charge?\nAnswer:electron", "source": "arc_easy"}
{"text": "Question: Which is a learned behavior?\nAnswer:A chimpanzee digs for termites with a stick.", "source": "arc_easy"}
{"text": "Question: Organisms that reproduce asexually generally have offspring that are\nAnswer:genetically identical.", "source": "arc_easy"}
{"text": "Question: Crows are found throughout many parts of the world. They are black birds with excellent hearing. In the wild they live for six to seven years. Some crows in Japan open hard-shelled nuts by dropping them in front of moving cars. Which of these is a learned behavior?\nAnswer:Dropping nuts in front of cars", "source": "arc_easy"}
{"text": "Question: Which object would best help a student determine if a block of an unknown material is magnetic?\nAnswer:paper clip", "source": "arc_easy"}
{"text": "Question: About how much of Earth's surface is covered by oceans?\nAnswer:about 70%", "source": "arc_easy"}
{"text": "Question: Sound will not travel in a\nAnswer:vacuum", "source": "arc_easy"}
{"text": "Question: What supplies most of the energy that plants need to make food?\nAnswer:sunlight", "source": "arc_easy"}
{"text": "Question: Which of the following is the main role of flowers found on most flowering plants?\nAnswer:to produce seeds", "source": "arc_easy"}
{"text": "Question: Which adaptation will warn predators not to eat an animal?\nAnswer:bright colors", "source": "arc_easy"}
{"text": "Question: The cones of a jack pine tree require great amounts of heat to release their seeds. When are jack pine tree seeds most likely released?\nAnswer:after a fire", "source": "arc_easy"}
{"text": "Question: When a thin slice from an onion is viewed through a microscope, lots of little box-like shapes are seen. These shapes are most likely\nAnswer:cells.", "source": "arc_easy"}
{"text": "Question: Which is an example of substances reacting chemically?\nAnswer:iron and oxygen forming rust", "source": "arc_easy"}
{"text": "Question: An object's hardness, taste, and texture are examples of\nAnswer:properties", "source": "arc_easy"}
{"text": "Question: Some objects conduct electricity. Which object is the best conductor of electricity?\nAnswer:a metal fork", "source": "arc_easy"}
{"text": "Question: Which of the following eras is known as the \"Age of Mammals\"?\nAnswer:Cenozoic", "source": "arc_easy"}
{"text": "Question: In Alaska, there are fewer hours of daylight in the winter than in the summer. Which statement best explains why this difference occurs?\nAnswer:The Northern Hemisphere is tilted away from the Sun in the winter.", "source": "arc_easy"}
{"text": "Question: Most of Earth's major earthquakes are caused by\nAnswer:faulting of rock in Earth's crust", "source": "arc_easy"}
{"text": "Question: A girl with long hair is going to be participating in an experiment that uses an alcohol burner for an energy source. What is the best thing for her to do to prepare for this experiment?\nAnswer:tie her hair back away from her face", "source": "arc_easy"}
{"text": "Question: Which factor would have the greatest influence on the southern migration of animals living in the Northern Hemisphere?\nAnswer:cold air temperatures", "source": "arc_easy"}
{"text": "Question: What carries oxygen throughout the body?\nAnswer:red blood cells", "source": "arc_easy"}
{"text": "Question: Which is the best example of an inherited behavior?\nAnswer:a cat clawing on a tree to sharpen its claws", "source": "arc_easy"}
{"text": "Question: What do all animals need in order to survive?\nAnswer:water, air, and food", "source": "arc_easy"}
{"text": "Question: Estella spilled tomato sauce on her shirt. When she washed her shirt, she noticed that the detergent she used contained enzymes. Enzymes are added to detergents to break down proteins from food and other substances that may stain clothing. Which would most likely inhibit the ability of the enzymes to remove the stain on her shirt?\nAnswer:the temperature of the water", "source": "arc_easy"}
{"text": "Question: Which of the following best describes an atom?\nAnswer:a core of protons and neutrons surrounded by electrons", "source": "arc_easy"}
{"text": "Question: At a weightlifting competition, two competitors lifted the same weight to the same height. The second competitor accomplished the lift 2 seconds faster than the first competitor. This demonstrated that the second competitor had more\nAnswer:power than the first.", "source": "arc_easy"}
{"text": "Question: The fur color of a bear varies with its environment. Polar bears found in the Arctic have white fur, while black bears found in Pennsylvania have dark fur. Which best describes the variation of fur color amongst the bear species?\nAnswer:structural adaptation", "source": "arc_easy"}
{"text": "Question: A car has a small gasoline engine combined with a battery-powered electric motor. When the car stops at a red light, the gasoline engine stops running and the electric motor begins working. How does this type of car most likely benefit people?\nAnswer:uses less gasoline", "source": "arc_easy"}
{"text": "Question: Increased populations can lead to the depletion of locally available resources. Compared to other communities, which of these locally available resources is most likely to be depleted in desert communities?\nAnswer:water", "source": "arc_easy"}
{"text": "Question: Where is the first place a scientist should present new research data about the structure of a galaxy in order to receive the most appropriate review of the research?\nAnswer:a peer-reviewed science journal", "source": "arc_easy"}
{"text": "Question: Which action most likely causes large rocks to become smaller pieces of rock?\nAnswer:weathering by wind and water", "source": "arc_easy"}
{"text": "Question: European starlings are birds that take over the nests of other birds. When they move into an area, starlings reproduce quickly. Taking over the nests of other birds most likely increases the number of starlings by helping them to do what?\nAnswer:compete for resources", "source": "arc_easy"}
{"text": "Question: Many bacteria are decomposer organisms. Which of the following statements best describes how these bacteria help make soil more fertile?\nAnswer:The bacteria break down plant and animal matter.", "source": "arc_easy"}
{"text": "Question: In Rutherford's experiment, what caused some high-energy particles to bounce off the metal, while most pass straight through?\nAnswer:positive charges", "source": "arc_easy"}
{"text": "Question: Jenny's class made an instrument to measure air pressure. The instrument is a\nAnswer:barometer.", "source": "arc_easy"}
{"text": "Question: Condensation in the water cycle can best be described as the result of water vapor\nAnswer:rising into the atmosphere, cooling and changing into a liquid form.", "source": "arc_easy"}
{"text": "Question: New carpet is being measured for a room that is 5.5 m by 4.6 m. On a measuring tape, what is the smallest unit that is necessary to measure the room accurately for the carpet?\nAnswer:centimeters", "source": "arc_easy"}
{"text": "Question: How does an ecosystem benefit when leaves fall from a tree and decompose on the soil?\nAnswer:Nutrients are released into the soil.", "source": "arc_easy"}
{"text": "Question: Which of the following gases do plants use in photosynthesis?\nAnswer:carbon dioxide", "source": "arc_easy"}
{"text": "Question: During an ice age, enormous ice sheets called glaciers increase in size on Earth's surface, resulting in decreased ocean depths. Due to global cooling, the water cycle is disrupted between which two stages to cause an increase in glacier size?\nAnswer:precipitation and runoff", "source": "arc_easy"}
{"text": "Question: Different units of measurement are more useful in some settings than in others. Which unit of measurement is most used when comparing distances within the solar system?\nAnswer:the astronomical unit", "source": "arc_easy"}
{"text": "Question: The formation of diamonds requires tremendous pressure that is generated\nAnswer:deep below the crust.", "source": "arc_easy"}
{"text": "Question: What characteristic helps a rabbit survive in a winter environment?\nAnswer:camouflage", "source": "arc_easy"}
{"text": "Question: A science class is taking a field trip to a forest to observe and study birds. Which tool would be most helpful for observing birds?\nAnswer:binoculars", "source": "arc_easy"}
{"text": "Question: An example of an instinct is\nAnswer:salmon returning to their birthplace to lay their eggs.", "source": "arc_easy"}
{"text": "Question: During which change of state do the particles of a substance move from being tightly packed together to having more freedom of movement?\nAnswer:a solid becoming a liquid", "source": "arc_easy"}
{"text": "Question: When astronauts walked on the Moon, they used weighted boots to help them walk due to the lower gravitational pull. What difference between Earth and the Moon accounts for the difference in gravity?\nAnswer:mass", "source": "arc_easy"}
{"text": "Question: A population of wood mice lives in a cool, moist temperate forest. Several years of hot, dry weather have affected the plants in the area. Which mice in the population are most likely to survive this change and pass their genes on to their offspring?\nAnswer:those with traits most adapted to the new environment", "source": "arc_easy"}
{"text": "Question: Harmful ultraviolet rays from the Sun are primarily absorbed by\nAnswer:ozone.", "source": "arc_easy"}
{"text": "Question: Which of these is most likely caused by the action of water, wind, and animals?\nAnswer:erosion", "source": "arc_easy"}
{"text": "Question: The core of Earth is divided into two layers. The outer core is made of\nAnswer:molten iron and nickel.", "source": "arc_easy"}
{"text": "Question: Offshore oil platforms affect ocean habitats. An ocean environment is most likely damaged by an offshore oil platform because\nAnswer:leaking oil from the oil platform might pollute the water", "source": "arc_easy"}
{"text": "Question: An object such as a hammer weighs less on the Moon than on Earth. This is because the Moon has a\nAnswer:lower mass than Earth.", "source": "arc_easy"}
{"text": "Question: A scientist plans a project to determine the effect of rain on the formation of caves. An area of rock has been chosen as the site for the investigation. How often should the scientist measure the changes in the rock?\nAnswer:every year", "source": "arc_easy"}
{"text": "Question: Which type of rock is formed from limestone that has been compacted, heated, and recrystallized?\nAnswer:marble", "source": "arc_easy"}
{"text": "Question: Isabel goes jogging for two miles on a sunny afternoon. At the end of her run, she is warmer. As Isabel jogs, which function does the skin perform to help stabilize her body temperature?\nAnswer:Her skin discharges water.", "source": "arc_easy"}
{"text": "Question: Which cell can survive without the help of other cells?\nAnswer:yeast cell", "source": "arc_easy"}
{"text": "Question: Two students make hot chocolate. One student pours the hot chocolate into a foam cup. The other student pours the hot chocolate into a metal cup. The metal cup becomes too hot to touch, but the foam cup can be held comfortably. The best explanation for this difference in temperature is that the foam cup-- A heats up much faster than the metal cup\nAnswer:is a better conductor of heat than the metal cup", "source": "arc_easy"}
{"text": "Question: Frogs and salamanders compete with each other for insects. Both frogs and salamanders catch flying insects with their tongues. Which feature would most likely help both animals compete for flying insects?\nAnswer:sticky tongues", "source": "arc_easy"}
{"text": "Question: Which interaction benefits both organisms?\nAnswer:a bee pollinating a flower", "source": "arc_easy"}
{"text": "Question: Which type of rock is formed when limestone is subjected to heat and pressure?\nAnswer:marble", "source": "arc_easy"}
{"text": "Question: Jenny measures the outside temperature as 16 degrees Celsius (\u00b0C), 61 degrees Fahrenheit (\u00b0F). She observes precipitation falling from the clouds in a solid form. What type of precipitation is Jenny most likely observing?\nAnswer:hail", "source": "arc_easy"}
{"text": "Question: A change in the environment that causes a response is known as a\nAnswer:stimulus", "source": "arc_easy"}
{"text": "Question: Aluminum is an element. Which of the following best describes the smallest particle of aluminum that retains all the properties of aluminum?\nAnswer:an atom", "source": "arc_easy"}
{"text": "Question: What advantage do sea stars gain from having radial symmetry?\nAnswer:They sense predators and potential food from all directions.", "source": "arc_easy"}
{"text": "Question: A student has a ball of clay that sinks when placed in a pan of water. Which property should he change to make the clay float?\nAnswer:shape", "source": "arc_easy"}
{"text": "Question: The population of which of the following 26 organisms would most likely decline if small animals like rats, rabbits, and snakes were eliminated from an ecosystem?\nAnswer:hawks", "source": "arc_easy"}
{"text": "Question: During a lab investigation, students were asked to determine the best way to clean up an oil spill using different materials. Investigation Materials \u2022 filter paper \u2022 foam sponge \u2022 metal wire screen \u2022 thin sock filled with hair The students tested the materials by placing each material into separate buckets containing oil and water. They recorded their observations on which material absorbed the most oil. Why would the students' teacher ask them to repeat their tests?\nAnswer:to improve the chances of obtaining accurate oil cleanup results", "source": "arc_easy"}
{"text": "Question: A delta can be seen from the air at the mouth of the Mississippi River. This delta was formed by\nAnswer:deposition of sediment.", "source": "arc_easy"}
{"text": "Question: The nose, mouth, and diaphragm are parts of which body system?\nAnswer:respiratory", "source": "arc_easy"}
{"text": "Question: Students are studying some leaves. They group the leaves by shape. Which science process are the students using when they put the leaves in different groups?\nAnswer:classifying", "source": "arc_easy"}
{"text": "Question: The thin, semi-permeable membrane that encloses a cell allows nutrients to enter and wastes to be\nAnswer:excreted.", "source": "arc_easy"}
{"text": "Question: A small, fast-moving river in is in a V-shaped valley on the slope of a mountain. If you follow the river to where it passes through a plain, what will the river most likely look like compared with how it looked on the mountain?\nAnswer:Slower and wider", "source": "arc_easy"}
{"text": "Question: The atmosphere of Mars is almost entirely composed of a greenhouse gas. Compared with Earth, which factor accounts for the low, nighttime surface temperatures on Mars?\nAnswer:The atmosphere on Mars has an extremely low density.", "source": "arc_easy"}
{"text": "Question: Asexually produced offspring are genetically\nAnswer:identical to the parent", "source": "arc_easy"}
{"text": "Question: A teacher asks her students to examine titles of four scientific articles. Which titled article is specifically about a chemical change?\nAnswer:How Baking Soda Reacts With Vinegar", "source": "arc_easy"}
{"text": "Question: Nuclear fusion is the source of energy for stars. Besides hydrogen, which other element is most likely also common in stars?\nAnswer:helium", "source": "arc_easy"}
{"text": "Question: Plants in a forest need to obtain nutrients from the soil to survive. How do most of the nutrients get back in the soil once the forest plants have used them for growth?\nAnswer:Organic matter recycles from dead organisms.", "source": "arc_easy"}
{"text": "Question: Conjugation in a paramecium differs from sexual reproduction in volvox because conjugation\nAnswer:results in two genetically identical cells.", "source": "arc_easy"}
{"text": "Question: Which of the following helps to produce urine in humans and other mammals?\nAnswer:kidneys", "source": "arc_easy"}
{"text": "Question: A scientist looks at a graph that shows the percentages of humus, clay, and sand that make up a soil. If the scientist had the total weight of each material, instead of percentages, what type of graph would be best to illustrate the data?\nAnswer:bar graph", "source": "arc_easy"}
{"text": "Question: Which unit of measurement describes an object's length?\nAnswer:meter", "source": "arc_easy"}
{"text": "Question: Which organ is part of the respiratory system?\nAnswer:lungs", "source": "arc_easy"}
{"text": "Question: The iron in iron-rich red soils may not be in a form that can be taken up by tree roots. As a result, leaves and needles may look yellow. Some trees release acids that convert iron in soil to a usable form. This change in soil chemistry is a type of which process?\nAnswer:weathering", "source": "arc_easy"}
{"text": "Question: The action that results when waves made in a pond strike the edges and bounce back is known as\nAnswer:reflection.", "source": "arc_easy"}
{"text": "Question: Sleet and hail are forms of\nAnswer:precipitation", "source": "arc_easy"}
{"text": "Question: Astronomers have determined the surface temperature of stars by studying their colors. What color emission represents stars with the hottest temperatures?\nAnswer:blue", "source": "arc_easy"}
{"text": "Question: Because sulfur cannot be decomposed by simple chemical methods into two or more different substances, it is classified as\nAnswer:an element.", "source": "arc_easy"}
{"text": "Question: The students watch ocean waves crash on a beach. Which statement describes what will most likely happen because of the waves?\nAnswer:Sand from the beach will wash away.", "source": "arc_easy"}
{"text": "Question: When plants and animals die, which organisms help return nutrients to the food chain?\nAnswer:decomposers", "source": "arc_easy"}
{"text": "Question: Which object used in an experiment can safely be recycled?\nAnswer:an aluminum can", "source": "arc_easy"}
{"text": "Question: Evidence that living things have evolved over hundreds of millions of years can be found in\nAnswer:rocks containing fossils", "source": "arc_easy"}
{"text": "Question: What causes the blue color of the sky?\nAnswer:scattering of light by matter in the atmosphere", "source": "arc_easy"}
{"text": "Question: As the population of small fish in a lake decreases, the population of large fish that depend on the small fish for food will\nAnswer:decrease in number", "source": "arc_easy"}
{"text": "Question: Living organisms require energy for biological processes. Chemical energy in a plant cell is\nAnswer:converted from solar energy.", "source": "arc_easy"}
{"text": "Question: Pollen is necessary for a flowering plant to\nAnswer:reproduce.", "source": "arc_easy"}
{"text": "Question: Which gas makes up the greatest percentage of Earth's atmosphere?\nAnswer:nitrogen", "source": "arc_easy"}
{"text": "Question: Which is the best explanation of the term ecology?\nAnswer:the study of organisms and their interactions with the environment", "source": "arc_easy"}
{"text": "Question: A student leaves a rock in the Sun on a bright afternoon. An hour after sunset, the weather is cool, but the rock still feels warm. The student has demonstrated a property of the rock resulting directly from which of the rock's other properties?\nAnswer:its specific heat", "source": "arc_easy"}
{"text": "Question: Which characteristic is not an inherited trait?\nAnswer:personality", "source": "arc_easy"}
{"text": "Question: Eating leafy vegetables is important for human health. This is because leafy vegetables are a good source of which of the following?\nAnswer:minerals", "source": "arc_easy"}
{"text": "Question: What is necessary to use on a telescope in order to photograph solar flares and solar prominences?\nAnswer:a light filter", "source": "arc_easy"}
{"text": "Question: Near Earth's equator, water generally exists naturally in the liquid and gas states. In which other part of Earth is water usually found naturally in only two states?\nAnswer:South Pole", "source": "arc_easy"}
{"text": "Question: A cat jumps when startled by a loud noise. This is an example of an organism\nAnswer:sensing and responding to its external environment", "source": "arc_easy"}
{"text": "Question: Which of the following materials would best slow the transfer of heat?\nAnswer:wood", "source": "arc_easy"}
{"text": "Question: What can cause a moving object to increase its speed in a forward direction?\nAnswer:a force that continually acts on the object in the direction the object is moving", "source": "arc_easy"}
{"text": "Question: In which oceanic zone do clams and crabs survive by burrowing in the sand?\nAnswer:intertidal", "source": "arc_easy"}
{"text": "Question: A manufacturing industry has asked to relocate its plant to your town. From an environmental perspective, which question is least important to ask before deciding whether the industry may move to your town?\nAnswer:What are the uses of the products that the plant will manufacture?", "source": "arc_easy"}
{"text": "Question: Some meteorologists use visual aids such as diagrams, maps, and charts when they present the weather to television viewers. How do different types of visual aids help the viewers understand complex weather phenomena?\nAnswer:by showing many components that impact the weather", "source": "arc_easy"}
{"text": "Question: Which renewable energy resource possesses the greatest potential for providing renewable energy to meet the future needs of the southern United States?\nAnswer:solar", "source": "arc_easy"}
{"text": "Question: A student performs an experiment and the results are shown below: Before- Iron filings are brown, small, and magnetic: Copper sulfate crystals are blue, brittle, and not magnetic. After- The copper formed was reddish, solid, and not magnetic: Iron sulfide solution was colorless and not magnetic. Which statement supports that a chemical reaction took place?\nAnswer:A new substance was formed.", "source": "arc_easy"}
{"text": "Question: In order for rocks to be classified as igneous, the rocks must\nAnswer:be formed from magma.", "source": "arc_easy"}
{"text": "Question: Which of these is most likely the cause of a father and son having almost identical-sounding voices?\nAnswer:inherited characteristics", "source": "arc_easy"}
{"text": "Question: Frog eggs hatch into tadpoles, and then tadpoles gradually develop into frogs. This process is known as\nAnswer:metamorphosis.", "source": "arc_easy"}
{"text": "Question: Many people like to use microwave ovens rather than traditional ovens. The main reason for this is that microwave ovens\nAnswer:take less time to cook food than regular ovens do.", "source": "arc_easy"}
{"text": "Question: When trees are removed from an area in a tropical rainforest, the area experiences an increase in soil erosion. Which statement best explains why removing the trees can lead to soil erosion?\nAnswer:There will be fewer roots to hold the soil in place.", "source": "arc_easy"}
{"text": "Question: What information is needed to calculate the speed of a car?\nAnswer:the distance travel", "source": "arc_easy"}
{"text": "Question: Freda always hangs her wet swimsuit outdoors after getting out of the swimming pool. Which of the following is least likely to affect the rate at which Freda's swimsuit dries?\nAnswer:the temperature of the water in the pool", "source": "arc_easy"}
{"text": "Question: Maria collected the gas given off by a glowing piece of charcoal. The gas was then bubbled through a small amount of colorless limewater. Part of Maria's report stated, \"After the gas was put into the jar, the limewater gradually changed to a milky white color.\" This statement is\nAnswer:an observation", "source": "arc_easy"}
{"text": "Question: Some butterflies live an average of two weeks. This period of time is called a life\nAnswer:span", "source": "arc_easy"}
{"text": "Question: Which two body systems work together to transport oxygen to the cells?\nAnswer:respiratory and circulatory", "source": "arc_easy"}
{"text": "Question: Some localized layers of rock contain the element iridium. Iridium is most often found in space objects such as meteoroids and asteroids. The discovery of these iridium-containing layers has been matched to which phenomena in Earth's history?\nAnswer:mass species extinctions", "source": "arc_easy"}
{"text": "Question: Which of these converts electrical energy to light energy?\nAnswer:a flashlight", "source": "arc_easy"}
{"text": "Question: Darwin's theory that animal species can change over time was inspired by his research on which set of islands?\nAnswer:the Galapagos Islands", "source": "arc_easy"}
{"text": "Question: An athlete is running a race. The athlete's body needs energy. Which organelle(s) in the athlete's cells supply the energy for cellular functions?\nAnswer:mitochondrion", "source": "arc_easy"}
{"text": "Question: Which of these would best help a scientist discover a new planet?\nAnswer:looking at the night sky with a telescope", "source": "arc_easy"}
{"text": "Question: Which of these lists has only products that come from plants?\nAnswer:Paper, spices, and fibers", "source": "arc_easy"}
{"text": "Question: Why is some food dehydrated for astronauts to eat in space?\nAnswer:to preserve the food for extended flights", "source": "arc_easy"}
{"text": "Question: Perfume sprayed from a bottle spreads more easily in a warm room of 25\u00b0C than in a cool room of 15\u00b0C. Which of the following correctly compares perfume molecules at 25\u00b0C to those at 15\u00b0C?\nAnswer:At 25\u00b0C, they are moving faster.", "source": "arc_easy"}
{"text": "Question: Which of the following is believed to be one cause of global warming?\nAnswer:atmospheric rise of carbon dioxide", "source": "arc_easy"}
{"text": "Question: What product was being formed as plants died and sank to the bottom of swamps?\nAnswer:coal", "source": "arc_easy"}
{"text": "Question: What is the approximate length of time it takes the Moon to complete one lunar cycle?\nAnswer:29 days", "source": "arc_easy"}
{"text": "Question: A line graph is best used when the measured variable is\nAnswer:changing at a constant rate.", "source": "arc_easy"}
{"text": "Question: All living things need energy to survive. What is the primary source of energy for all living things?\nAnswer:the sun", "source": "arc_easy"}
{"text": "Question: If a chemical reaction such as photosynthesis begins with 6 atoms of carbon [C], how many atoms of carbon [C] should be in the products?\nAnswer:6 atoms of carbon [C]", "source": "arc_easy"}
{"text": "Question: Which object refracts light?\nAnswer:glass prism", "source": "arc_easy"}
{"text": "Question: A gastroenterologist is a doctor who treats problems of the esophagus, stomach, and intestines. Which organ system is cared for by this type of doctor?\nAnswer:digestive system", "source": "arc_easy"}
{"text": "Question: Which event becomes more likely during a drought in a prairie ecosystem?\nAnswer:fire", "source": "arc_easy"}
{"text": "Question: When scientists publish papers describing the results and conclusions of their experiments, members of the scientific community should\nAnswer:evaluate the evidence in the paper.", "source": "arc_easy"}
{"text": "Question: Kim lost her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?\nAnswer:chemical", "source": "arc_easy"}
{"text": "Question: Which human activity has most negatively affected air quality?\nAnswer:burning coal", "source": "arc_easy"}
{"text": "Question: Most of the bacteria in a forest ecosystem are best classified as which of the following types of organisms?\nAnswer:decomposers", "source": "arc_easy"}
{"text": "Question: A pencil falls off of a desk. What moves the pencil toward the floor?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: All of the processes listed below cause changes in Earth's surface. Which of the following is the slowest to change Earth's surface?\nAnswer:weathering", "source": "arc_easy"}
{"text": "Question: A group of students was preparing an activity to determine whether certain materials will float or sink when placed on water. Before the experiment started, one student said, \"I think the sponge will float.\" This statement was\nAnswer:a prediction", "source": "arc_easy"}
{"text": "Question: What tool is used to determine the mass of an object?\nAnswer:Balance", "source": "arc_easy"}
{"text": "Question: According to the Periodic Table of the Elements, mercury (Hg) is different from other metals because mercury is\nAnswer:liquid at room temperature.", "source": "arc_easy"}
{"text": "Question: When using more than the recommended amounts of pesticide on farmland, yards, and gardens, what is most likely to occur?\nAnswer:Water supplies can be contaminated by pesticide runoff.", "source": "arc_easy"}
{"text": "Question: According to the fossil record, when did episodes of rapid speciation commonly take place?\nAnswer:following mass extinctions", "source": "arc_easy"}
{"text": "Question: A deer inherits some of its features from its parents. Other features come from its environment. Which feature would a deer most likely inherit from its parents?\nAnswer:brown eyes", "source": "arc_easy"}
{"text": "Question: What is the smallest structural and functional unit of the nervous system?\nAnswer:neuron", "source": "arc_easy"}
{"text": "Question: Male peacocks have large brightly colored tail feathers. What is the most likely reason for this?\nAnswer:to attract potential mates", "source": "arc_easy"}
{"text": "Question: In a city, the daily high and low 16 temperatures for a month are best represented by which of the following?\nAnswer:line graph", "source": "arc_easy"}
{"text": "Question: Drew was measuring the growth of a vine that can grow almost 31 cm a day. Which would be the best way to record his data of the growth over a period of a day?\nAnswer:a line graph", "source": "arc_easy"}
{"text": "Question: All of the following are functions of a cell membrane except\nAnswer:producing energy for cell processes.", "source": "arc_easy"}
{"text": "Question: Which characteristic will a baby chimpanzee inherit from its parents?\nAnswer:fur color", "source": "arc_easy"}
{"text": "Question: Which object is the best conductor of electricity?\nAnswer:an iron nail", "source": "arc_easy"}
{"text": "Question: Why are some rocks smoother and rounder than others?\nAnswer:They were smoothed by the action of wind and water.", "source": "arc_easy"}
{"text": "Question: A vaccine can prevent a serious disease. When a new vaccine is developed, it is given to a small group of people. Why would it be important to test each vaccine on a small group of people before everyone can have one?\nAnswer:to determine how the vaccine will affect people", "source": "arc_easy"}
{"text": "Question: When can producers make the most food?\nAnswer:summer, because there is more sunlight", "source": "arc_easy"}
{"text": "Question: Plants have special tissues that transport food, water, and minerals throughout the plant. What are these tissues similar to in animals?\nAnswer:arteries and veins", "source": "arc_easy"}
{"text": "Question: Which of the following statements best explains how the decomposition of plant and animal matter helps to form rich soils?\nAnswer:Decomposition adds nutrients to soil.", "source": "arc_easy"}
{"text": "Question: Beans and coal both have stored energy. Where did the energy come from that is stored in beans and coal?\nAnswer:From the Sun's light", "source": "arc_easy"}
{"text": "Question: A metal ball has a constant velocity of zero. Which other quantity must also be zero?\nAnswer:acceleration of the ball", "source": "arc_easy"}
{"text": "Question: What geographic obstacle causes water to condense in an air mass as the air mass moves?\nAnswer:mountains", "source": "arc_easy"}
{"text": "Question: If an object is attracted to a magnet, the object is most likely made of\nAnswer:metal", "source": "arc_easy"}
{"text": "Question: Which explains the pattern of day and night?\nAnswer:Earth spins on its axis.", "source": "arc_easy"}
{"text": "Question: Which is the best plan to make the fossil fuel supply last longer?\nAnswer:reduce electricity use", "source": "arc_easy"}
{"text": "Question: The stages of evolution of a star are determined by the mass of the star at the beginning of its life cycle. Which stage of evolution is the oldest form of a massive star?\nAnswer:neutron star", "source": "arc_easy"}
{"text": "Question: Which of these best indicates that sediments can be changed into rock?\nAnswer:layers of sandstone", "source": "arc_easy"}
{"text": "Question: Carbon cycles through several Earth subsystems. Which sequence most directly leads to the cycling of carbon that can result in the formation of petroleum?\nAnswer:biosphere to lithosphere", "source": "arc_easy"}
{"text": "Question: Which word best describes the speed of a cart that has a positive velocity and a negative acceleration?\nAnswer:decreasing", "source": "arc_easy"}
{"text": "Question: A hurricane is a heat engine which converts one kind of energy into another. Hurricanes convert most of the heat energy into\nAnswer:mechanical energy.", "source": "arc_easy"}
{"text": "Question: Which of the following is a crucial piece of evidence supporting scientists' theory of how the continents and the ocean basins formed?\nAnswer:Currents redistribute heat in an unevenly heated liquid.", "source": "arc_easy"}
{"text": "Question: What motion causes day and night?\nAnswer:rotation of Earth", "source": "arc_easy"}
{"text": "Question: The axis of Earth is tilted at an angle of 23.5\u00b0 from the vertical position. Which of the following is the main result of this tilt?\nAnswer:change of seasons", "source": "arc_easy"}
{"text": "Question: In an earthquake, the primary waves move through\nAnswer:rock", "source": "arc_easy"}
{"text": "Question: Which of the following is the major cause of tides?\nAnswer:gravitational pull of the Moon", "source": "arc_easy"}
{"text": "Question: A dog opens its mouth and lets its tongue hang out. A human's body produces sweat. These are two ways that organisms may adjust to\nAnswer:hot temperatures", "source": "arc_easy"}
{"text": "Question: Fires in forests from lightning rid the forest of dead branches and leaves. If the trees survive and the soil remains intact, the forest will experience regrowth to its climax state by which process?\nAnswer:succession", "source": "arc_easy"}
{"text": "Question: A class planted trees and shrubs in an empty dirt lot beside the school. The roots of the plants can help protect the soil. The soil is most likely being protected from what?\nAnswer:wind erosion", "source": "arc_easy"}
{"text": "Question: In the process of photosynthesis, sunlight is converted into\nAnswer:chemical energy.", "source": "arc_easy"}
{"text": "Question: Vascular plants have tissue called xylem. Which of these is transported by the xylem?\nAnswer:water needed by the plant", "source": "arc_easy"}
{"text": "Question: If Lisa wants to experiment with bean plants, which of these is the best example of a hypothesis?\nAnswer:Fertilizer will make bean plants grow taller.", "source": "arc_easy"}
{"text": "Question: A jeweler melts gold to make jewelry. As the gold melts, the mass\nAnswer:stays the same.", "source": "arc_easy"}
{"text": "Question: Which of the following tools is most useful for tightening a small mechanical fastener?\nAnswer:pliers", "source": "arc_easy"}
{"text": "Question: Oil, coal, and natural gas are fossil fuels formed under what conditions?\nAnswer:high temperature and high pressure", "source": "arc_easy"}
{"text": "Question: Some birds build nests in the spring. This nest building is a seasonal adaptation that occurs to help the birds\nAnswer:protect their young", "source": "arc_easy"}
{"text": "Question: Which tool is used to measure the volume of a liquid?\nAnswer:graduated cylinder", "source": "arc_easy"}
{"text": "Question: The functions of a plant's roots are to support the plant and\nAnswer:take in water and nutrients", "source": "arc_easy"}
{"text": "Question: All of the inherited traits that are passed to offspring during asexual reproduction come from a single\nAnswer:parent.", "source": "arc_easy"}
{"text": "Question: What energy transformation occurs when an electric lamp is turned on?\nAnswer:electrical energy to light and heat energy", "source": "arc_easy"}
{"text": "Question: Which phase change in the atmosphere forms clouds?\nAnswer:condensation", "source": "arc_easy"}
{"text": "Question: Where are the most reactive nonmetals located on the periodic table?\nAnswer:the second column from the right side of the table", "source": "arc_easy"}
{"text": "Question: Who was a leading authority on continental drift in the early 1900s?\nAnswer:Alfred Wegener", "source": "arc_easy"}
{"text": "Question: In addition to oxygen, which gases make up the largest percentage of Earth's atmosphere?\nAnswer:carbon dioxide, water vapor, and nitrogen", "source": "arc_easy"}
{"text": "Question: For many years, people have been curious about the stars. In the past, people have shared what they knew about the stars through stories and drawings. Which pair of tools would be most helpful for people today to gather and share information about stars?\nAnswer:a telescope and a computer", "source": "arc_easy"}
{"text": "Question: During a presentation on astronomy, Professor Williams discussed various measurements in space. Which objects was she referring to when she talked about how astronomical units (AU) were determined?\nAnswer:the Sun and Earth", "source": "arc_easy"}
{"text": "Question: As more people have moved to the beach, the sea turtle population has decreased. Which is most likely the cause of this decrease?\nAnswer:habitat loss", "source": "arc_easy"}
{"text": "Question: The skin of a chameleon can change colors to help it blend with its surroundings. How would this adaptation most likely help a chameleon survive?\nAnswer:by helping the chameleon hide from its predators", "source": "arc_easy"}
{"text": "Question: A student examines a new watch design. The watch has a small solar cell on its face. The main function of the solar cell is to\nAnswer:provide an energy source for the watch.", "source": "arc_easy"}
{"text": "Question: The presence of which of the following geological features provides the best evidence that glaciers once covered an area?\nAnswer:U-shaped valleys", "source": "arc_easy"}
{"text": "Question: Which of these is a way the people of Virginia can help restore a natural ecosystem?\nAnswer:Plant native plants", "source": "arc_easy"}
{"text": "Question: A student wants to figure out how many calories are needed to perform various activities. A list of some everyday activities is made, and the number of calories burned during each activity is recorded. Which method is the best way for the student to display and evaluate the information?\nAnswer:create a table", "source": "arc_easy"}
{"text": "Question: Sedimentary deposits formed from organic material tend to include a high amount of\nAnswer:carbon.", "source": "arc_easy"}
{"text": "Question: According to the Big Bang Theory, which element most likely formed first?\nAnswer:hydrogen", "source": "arc_easy"}
{"text": "Question: Tim and Carla play catch with a ball. Which term describes the motion of a ball?\nAnswer:speed", "source": "arc_easy"}
{"text": "Question: Which set of equipment would be best to use when investigating what is found in a sample of pond water?\nAnswer:microscope, eye dropper, slides", "source": "arc_easy"}
{"text": "Question: The Theory of Plate Tectonics revolutionized scientific thought because it\nAnswer:explained the movement of oceanic and continental crusts.", "source": "arc_easy"}
{"text": "Question: How does repeating an experiment improve the likelihood of obtaining accurate results?\nAnswer:Data can be compared.", "source": "arc_easy"}
{"text": "Question: One hundred grams of water and 100 grams of vegetable oil are heated in identical containers at 70\u00b0C for 5 minutes. Their temperatures at the end of 5 minutes are different due to the difference in which property?\nAnswer:specific heat", "source": "arc_easy"}
{"text": "Question: There are MORE hours of sunlight in the Northern Hemisphere during which season?\nAnswer:summer", "source": "arc_easy"}
{"text": "Question: Which force produces energy as heat?\nAnswer:friction", "source": "arc_easy"}
{"text": "Question: Biologists have discovered that the beluga whales of Canada's St. Lawrence River have the highest rates of cancer among animals. What is most likely the reason for this high incidence of cancer in these whales?\nAnswer:chemical and pollutant runoff into the ocean", "source": "arc_easy"}
{"text": "Question: Reading from left to right, elements in the same period on the Periodic Table of the Elements\nAnswer:increase in atomic number.", "source": "arc_easy"}
{"text": "Question: A device that converts light energy into electricity used in many handheld calculators is a\nAnswer:photovoltaic cell.", "source": "arc_easy"}
{"text": "Question: Which most accurately describes a circle (pie) graph?\nAnswer:used to describe how part of the data relates to all of the data", "source": "arc_easy"}
{"text": "Question: Which organisms benefit in the relationship between bees and flowering plants?\nAnswer:both the bees and the flowering plants", "source": "arc_easy"}
{"text": "Question: The orbit of Earth is almost circular and has a period of about 365 days. Compared to the orbit of Earth, which of these objects usually have highly elliptical orbits and can have periods of over 1000 years?\nAnswer:comets", "source": "arc_easy"}
{"text": "Question: How is the theory of plate tectonics different from a hypothesis regarding a certain aspect of plate movement?\nAnswer:The theory explains a number of related observations.", "source": "arc_easy"}
{"text": "Question: A large quantity of heavy rain falling in a short time period will most likely\nAnswer:reduce the amount of nutrients in the soil.", "source": "arc_easy"}
{"text": "Question: An artificial pacemaker is a device that regulates the beat of the heart by an electrical stimulus. Some early pacemakers were powered by batteries and were worn externally with wires passing through the skin to the surface of the heart. Modern pacemakers are now much smaller and are implanted surgically. Which most likely has increased the lifespan and effectiveness of artificial pacemakers?\nAnswer:the invention of lithium batteries", "source": "arc_easy"}
{"text": "Question: A balloon filled with helium gas is set free and starts to move upward. Which of the following best explains why the helium balloon moves upward?\nAnswer:The density of helium is less than the density of air.", "source": "arc_easy"}
{"text": "Question: Oscar and Andre used a microscope to observe a sample of pond water and drew an example of each type of organism they saw. Then they compared their drawings. They discovered that their drawings of a euglena and a paramecium were alike, but their amoeba drawings had very different shapes. What are two things that Oscar's amoeba could have been doing that made his drawing look different from Andre's?\nAnswer:eating and moving", "source": "arc_easy"}
{"text": "Question: The reading on a barometer rises when the air\nAnswer:pressure increases.", "source": "arc_easy"}
{"text": "Question: Which of the following processes is responsible for changing liquid water into water vapor?\nAnswer:evaporation", "source": "arc_easy"}
{"text": "Question: In an atom, protons plus neutrons make up the atom's\nAnswer:atomic mass.", "source": "arc_easy"}
{"text": "Question: A generator converts mechanical energy to electrical energy by using a conducting metal loop turning in a\nAnswer:magnetic field.", "source": "arc_easy"}
{"text": "Question: Deer live in forest for shelter. If the forest was cut down, which situation would most likely happen?\nAnswer:The deer would move to another forest area.", "source": "arc_easy"}
{"text": "Question: Which physical property is important to have in a material used in cookware?\nAnswer:good conductor of heat", "source": "arc_easy"}
{"text": "Question: Which sentence describes a characteristic of offspring produced by sexual reproduction?\nAnswer:The offspring contain genetic material from both parents.", "source": "arc_easy"}
{"text": "Question: What is involved in creating genetically modified bacteria?\nAnswer:using biotechnology techniques", "source": "arc_easy"}
{"text": "Question: Which of the following structures does a frog develop as it changes from a tadpole to an adult frog?\nAnswer:lungs", "source": "arc_easy"}
{"text": "Question: One cause of heat in a car engine is caused by friction between parts. Which of these reduces the amount of heat produced by friction?\nAnswer:oil", "source": "arc_easy"}
{"text": "Question: The primary functions of the digestive system are to break down food, absorb nutrients and excrete wastes. Once food is absorbed, what system is responsible for carrying the nutrients to the body cells?\nAnswer:circulatory system", "source": "arc_easy"}
{"text": "Question: If you breathe on a mirror, part of the mirror clouds up. What are you actually seeing when you see the mirror cloud up?\nAnswer:Water droplets that formed from cooled water vapor in your breath", "source": "arc_easy"}
{"text": "Question: The surface of the Moon is made up of\nAnswer:craters, highlands, and flat areas", "source": "arc_easy"}
{"text": "Question: Which sequence correctly shows the levels of increasing organization in the human body?\nAnswer:cells -> tissues -> organs -> organ systems", "source": "arc_easy"}
{"text": "Question: Which layer of the atmosphere contains the greatest amount of water vapor?\nAnswer:troposphere", "source": "arc_easy"}
{"text": "Question: What should a scientist do to help make sure the results of an experiment are unbiased?\nAnswer:Ask other scientists to attempt to reproduce the results.", "source": "arc_easy"}
{"text": "Question: Which property of water allows it to dissolve many different substances?\nAnswer:It is a polar molecule.", "source": "arc_easy"}
{"text": "Question: Nevada is much drier than regions in California that are at the same latitude. Compared to these regions in California, which feature of Nevada contributes most to this dry climate?\nAnswer:mountain ranges to the west", "source": "arc_easy"}
{"text": "Question: A chemist observed bubbling and fizzing after adding an acid solution to a white powdery substance in a beaker. Which of the following can be inferred?\nAnswer:The acid and powder formed a new product.", "source": "arc_easy"}
{"text": "Question: Which of the following is visible through a reflecting telescope?\nAnswer:moons around Jupiter", "source": "arc_easy"}
{"text": "Question: A student is using hydrochloric acid in an investigation. Which piece of safety equipment is most important during this investigation?\nAnswer:goggles", "source": "arc_easy"}
{"text": "Question: Generally, the deeper rock layers of Earth are older than shallower rock layers. How can the collision of two tectonic plates change the order of the rock layers?\nAnswer:The rock layers are compressed forming faults and folds.", "source": "arc_easy"}
{"text": "Question: Which instrument should a student use to best examine bacteria?\nAnswer:microscope", "source": "arc_easy"}
{"text": "Question: Matter that is vibrating is producing ___.\nAnswer:sound", "source": "arc_easy"}
{"text": "Question: Falling and rising air and water molecules inside of clouds are believed to be factors in the formation of lightning. Which kind of energy transfer is taking place to cause this weather phenomenon?\nAnswer:mechanical to electrical", "source": "arc_easy"}
{"text": "Question: Sleet, rain, snow, and hail are forms of\nAnswer:precipitation", "source": "arc_easy"}
{"text": "Question: A windstorm knocks down many trees in a national park. Timber companies want to get rid of the fallen trees. How would this most likely harm the park ecosystem?\nAnswer:removes available nutrients", "source": "arc_easy"}
{"text": "Question: A plant has yellow flowers. What best explains why the flowers are yellow?\nAnswer:The flowers of the parent plants were yellow.", "source": "arc_easy"}
{"text": "Question: Which tool is used to determine the mass of an object?\nAnswer:balance", "source": "arc_easy"}
{"text": "Question: Prairie dogs can run very quickly. This adaptation enables the prairie dog to\nAnswer:escape from predators.", "source": "arc_easy"}
{"text": "Question: A student has a liquid that does not mix with water. To predict whether the liquid will float on water or sink beneath it, which tools should be used to examine the liquid?\nAnswer:graduated cylinder and balance", "source": "arc_easy"}
{"text": "Question: Samuel investigated the effect of temperature on the growth of snapdragons. He recorded the results from the investigation and found that snapdragons do not grow well in low temperatures. What is the purpose of this conclusion in the scientific process?\nAnswer:It helps to evaluate the hypothesis.", "source": "arc_easy"}
{"text": "Question: Which of the following best describes the purpose of cellular respiration?\nAnswer:to provide energy for cell activities", "source": "arc_easy"}
{"text": "Question: In a meadow ecosystem, mice receive most of the energy they need to survive directly from which of the following sources?\nAnswer:plants", "source": "arc_easy"}
{"text": "Question: Which environmental stimulus causes leaves on certain trees to change color in autumn?\nAnswer:changes to amount of light", "source": "arc_easy"}
{"text": "Question: How does the length of daylight in New York State change from summer to fall?\nAnswer:It decreases.", "source": "arc_easy"}
{"text": "Question: What is the name of the product formed from the reaction shown below? 4Fe(III) + 3O_{2} -> 2Fe_{2}O_{3}\nAnswer:iron (III) oxide", "source": "arc_easy"}
{"text": "Question: What type of galaxy is the Milky Way?\nAnswer:spiral", "source": "arc_easy"}
{"text": "Question: One thing that all human cells have in common is that they\nAnswer:take in energy.", "source": "arc_easy"}
{"text": "Question: Which two systems of the body are interacting when a runner sprains his ankle?\nAnswer:the muscular system and the nervous system", "source": "arc_easy"}
{"text": "Question: Jupiter is the largest planet in the solar system. It rotates on its axis once about every 10 hours. What time period on Earth would be 10 hours long if Earth rotated on its axis once every 10 hours?\nAnswer:a day", "source": "arc_easy"}
{"text": "Question: The elements sulfur (S) and oxygen (O2) combine to form a substance called sulfur dioxide (SO2). Sulfur dioxide is also formed when coal and oil are burned. Sulfur dioxide can best be described as\nAnswer:a compound", "source": "arc_easy"}
{"text": "Question: Which is a major difference between the life cycles of different types of plants?\nAnswer:the way they reproduce", "source": "arc_easy"}
{"text": "Question: Sunlight passes through the windows of a car and causes the car seats to get hot. Which type of energy flow is involved in heating the seats?\nAnswer:radiation", "source": "arc_easy"}
{"text": "Question: When a large oak tree is cut down in a forest, it leaves a gap in the forest canopy which allows smaller trees to quickly grow in the available sunlight. Which interaction is best represented among the smaller trees?\nAnswer:competition", "source": "arc_easy"}
{"text": "Question: How long does it take for the Moon to rotate on its axis?\nAnswer:one month", "source": "arc_easy"}
{"text": "Question: What is one way that humans can maintain good health?\nAnswer:exercise daily", "source": "arc_easy"}
{"text": "Question: Which is an example of a group of cells with a common structure and function?\nAnswer:muscle tissue", "source": "arc_easy"}
{"text": "Question: Sickle cell anemia is a genetic disease caused by an autosomal recessive gene. If each parent carries one sickle cell allele, what are the chances that their child will have sickle cell anemia?\nAnswer:one in four", "source": "arc_easy"}
{"text": "Question: Which statement describes animal embryos?\nAnswer:represent the earliest stage of development", "source": "arc_easy"}
{"text": "Question: The average temperature of the surface of Earth has increased approximately 1\u00b0C in the past century. Which reason best explains this increase in temperature?\nAnswer:higher levels of carbon dioxide in the atmosphere", "source": "arc_easy"}
{"text": "Question: As the population in an area grows, water usage increases. Eventually, water usage can outstrip the supply. Which measure to increase the amount of available water demonstrates the best stewardship of the resource?\nAnswer:reducing water usage through conservation measures", "source": "arc_easy"}
{"text": "Question: Which action illustrates a chemical change?\nAnswer:burning wood chips", "source": "arc_easy"}
{"text": "Question: Which tool could be used to help someone count the number of ladybugs on a leaf?\nAnswer:hand lens", "source": "arc_easy"}
{"text": "Question: Which two activities use most of the water used in an average U.S. household?\nAnswer:flushing toilets and washing clothes", "source": "arc_easy"}
{"text": "Question: Which are the best tools to use for growing and studying bacterial cultures?\nAnswer:Petri dishes", "source": "arc_easy"}
{"text": "Question: Which effect would the growing of legume crops such as beans and soybeans have?\nAnswer:more usable nitrogen for other plants", "source": "arc_easy"}
{"text": "Question: Which relationship between Earth's outer core and inner core generates a large portion of Earth's magnetic field?\nAnswer:their relative motions", "source": "arc_easy"}
{"text": "Question: Which order of succession of natural communities would most likely occur in New York State?\nAnswer:grasses -> bushes -> trees", "source": "arc_easy"}
{"text": "Question: White light can be separated into all of its component colors by\nAnswer:passing the light through a prism.", "source": "arc_easy"}
{"text": "Question: An Italian scientist named Alessandro Volta invented the Voltaic pile in 1800. It was able to produce a steady electrical current. Based on this description, what is the modern equivalent of the Voltaic pile?\nAnswer:a battery", "source": "arc_easy"}
{"text": "Question: Which would cause the most soil to erode from a river bank in just a few days?\nAnswer:water from a flood flowing over the river bank", "source": "arc_easy"}
{"text": "Question: A student is measuring a liquid in a graduated cylinder. The student is not tall enough to read the measurement at eye level. Which of these is the best action for the student to take to read the measurement correctly?\nAnswer:move the graduated cylinder to a lower table", "source": "arc_easy"}
{"text": "Question: When Isaac Newton theorized that gravity caused objects to fall to the ground, he had also discovered the force that causes\nAnswer:the planets to orbit the Sun.", "source": "arc_easy"}
{"text": "Question: A disorder is associated with certain flaws in the human respiratory system. Which is most likely a typical symptom of this disorder?\nAnswer:difficulty breathing", "source": "arc_easy"}
{"text": "Question: Which of these is the main contributor to the formation of hurricanes?\nAnswer:warm ocean air", "source": "arc_easy"}
{"text": "Question: Which statement correctly describes why there are fewer than 24 hours of daylight in Alaska during each day in April?\nAnswer:Earth\u2019s rotation causes both day and night.", "source": "arc_easy"}
{"text": "Question: What best describes objects orbiting in the Kuiper Belt?\nAnswer:icy", "source": "arc_easy"}
{"text": "Question: Coal was made from the remains of which ancient ecosystem?\nAnswer:green swamps", "source": "arc_easy"}
{"text": "Question: Which of these describes a location where minerals are most likely to form?\nAnswer:cooled magma from a volcano", "source": "arc_easy"}
{"text": "Question: In 1971, the bones of an extinct flying dinosaur were discovered. This kind of discovery helps everyone learn more about\nAnswer:history of animal species on Earth.", "source": "arc_easy"}
{"text": "Question: Which could be a possible way to prevent wildlife species from becoming endangered?\nAnswer:establishing more habitats", "source": "arc_easy"}
{"text": "Question: The chemical reaction of ethane and oxygen produces carbon dioxide and water. Which is the best form to identify reactants and products of the reaction?\nAnswer:an equation", "source": "arc_easy"}
{"text": "Question: Rheumatoid arthritis is a disease that occurs when the body attacks its own tissues. Which body system becomes disordered first?\nAnswer:immune", "source": "arc_easy"}
{"text": "Question: Variation in which property between water at different temperatures contributes most to the formation of horizontal ocean layers having distinct temperatures?\nAnswer:density", "source": "arc_easy"}
{"text": "Question: Which event would most likely cause a rapid extinction of organisms?\nAnswer:a large asteroid impact", "source": "arc_easy"}
{"text": "Question: When an octopus feels threatened, it can release black ink into the water. The ink MOST likely helps the octopus\nAnswer:hide from predators.", "source": "arc_easy"}
{"text": "Question: Which is a way the agricultural biotechnology industry could have a positive impact on the environment?\nAnswer:by reducing the need for countries to import food", "source": "arc_easy"}
{"text": "Question: The following statements are from an article in a fitness magazine. Which of these is an opinion?\nAnswer:People should exercise because it makes them feel better.", "source": "arc_easy"}
{"text": "Question: Which pair of items will repel each other?\nAnswer:a negatively-charged plastic strip and a negatively-charged piece of cloth", "source": "arc_easy"}
{"text": "Question: In your body, what two organs work together to make sure that oxygen gets to all the other organs of your body?\nAnswer:Heart and lungs", "source": "arc_easy"}
{"text": "Question: Each organ in the digestive system has a specific function. During digestion, food passes from the stomach into the small intestine. Which statement best describes what takes place in the small intestine?\nAnswer:Nutrients are absorbed from the food.", "source": "arc_easy"}
{"text": "Question: Which structure is found in producers in nearly all ecosystems?\nAnswer:chloroplasts", "source": "arc_easy"}
{"text": "Question: A strawberry farmer finds that, after a hard freeze, some of his strawberries are still alive. Which best explains why these strawberries were able to survive?\nAnswer:They have different genetic variations that cause them to be more resistant to cold temperatures.", "source": "arc_easy"}
{"text": "Question: Which event would most likely result in more food for organisms that are scavengers?\nAnswer:Fish die and sink to the bottom of a pond.", "source": "arc_easy"}
{"text": "Question: When you are riding a bicycle at night, your bicycle's reflectors help people in cars see your bicycle. How do bicycle reflectors work?\nAnswer:They bounce light back from other sources.", "source": "arc_easy"}
{"text": "Question: From Earth, the Sun appears brighter than any other star because the Sun is the\nAnswer:closest star.", "source": "arc_easy"}
{"text": "Question: Scientists found fish fossils in the desert. What do the fossils tell about this environment when the fish were alive?\nAnswer:There were lakes with water plants.", "source": "arc_easy"}
{"text": "Question: Chinese and European societies can use different but effective technologies when addressing medical questions. What does this demonstrate?\nAnswer:Varied approaches can yield successful technologies.", "source": "arc_easy"}
{"text": "Question: The exotic plant Melaleuca, or Australian Pine, has increased the intensity of fires across the Everglades. The amount of fuel available for fires has increased due to the presence of the Melaleuca. The Melaleuca releases massive numbers of seeds in response to fire, drought, and herbicide damage. Which best describes the reason the Melaleuca has been able to survive?\nAnswer:adaptation", "source": "arc_easy"}
{"text": "Question: Water that is used to cool nuclear power plants can be released into water bodies, causing an area called a thermal plume. A thermal plume can be 12-18\u00b0C warmer than surrounding waters. Although some fish may be attracted to the warmer water, other organisms may not be able to survive. Government officials order a study to determine the effects of a thermal plume in a water body near a nuclear power plant in North Carolina. Which factor most related to temperature should the study focus on in order to determine whether the thermal plume is damaging the health of the water system?\nAnswer:dissolved oxygen", "source": "arc_easy"}
{"text": "Question: What is a galaxy?\nAnswer:a very large system of stars that is held together by gravity", "source": "arc_easy"}
{"text": "Question: Which part of a strawberry plant absorbs most of the water needed by the plant?\nAnswer:roots", "source": "arc_easy"}
{"text": "Question: In cherry tomatoes, red color (R) is dominant to yellow color (r). If two heterozygous plants are crossed, what percentage of the offspring will be yellow?\nAnswer:25%", "source": "arc_easy"}
{"text": "Question: Which situation is an example of a feedback system in the body that maintains homeostasis?\nAnswer:the brain signaling blood vessels to return to normal", "source": "arc_easy"}
{"text": "Question: Which human organ system produces sperm or egg cells?\nAnswer:reproductive system", "source": "arc_easy"}
{"text": "Question: In the human body the digestion of proteins takes place primarily in which two organs?\nAnswer:Stomach and small intestine", "source": "arc_easy"}
{"text": "Question: What is the source of the organic matter needed for most fertile soils?\nAnswer:decaying plants", "source": "arc_easy"}
{"text": "Question: A scientist finds the bones of a dinosaur. What could help the scientist determine the approximate age of the dinosaur bones?\nAnswer:the index fossils in the area of the bones", "source": "arc_easy"}
{"text": "Question: A pond is near river but not connected to it. What would most likely allow fish to move from the pond to the river?\nAnswer:a flood", "source": "arc_easy"}
{"text": "Question: A characteristic that all living organisms have in common is they\nAnswer:are made of cells.", "source": "arc_easy"}
{"text": "Question: When the cells in an organism divide and reproduce, the organism can grow. Which cell organelle contains the genetic material for reproduction?\nAnswer:the nucleus", "source": "arc_easy"}
{"text": "Question: Measurements of carbon dioxide concentrations in the air taken over the past decade have shown a\nAnswer:dramatic increase.", "source": "arc_easy"}
{"text": "Question: All matter is made up of particles called\nAnswer:atoms", "source": "arc_easy"}
{"text": "Question: Which of the following energy conversions takes place in a battery-operated flashlight?\nAnswer:chemical -> electrical -> light", "source": "arc_easy"}
{"text": "Question: Which of these is most likely harmful to an ecosystem?\nAnswer:Building new homes in a wetland", "source": "arc_easy"}
{"text": "Question: Which units are best to measure the amount of rain that fell during a thunderstorm?\nAnswer:centimeters", "source": "arc_easy"}
{"text": "Question: Noah visited a park that had many oak trees. Which best describes the role of an oak tree in its ecosystem?\nAnswer:Oak trees are a source of food and shelter for animals.", "source": "arc_easy"}
{"text": "Question: Which of these resources will most likely be depleted first?\nAnswer:Fossil fuels", "source": "arc_easy"}
{"text": "Question: When athletes begin to exercise, their heart rates and respiration rates increase. At what level of organization does the human body coordinate these functions?\nAnswer:at the system level", "source": "arc_easy"}
{"text": "Question: A student heated a pan of soup on a stove. While stirring the soup with a metal spoon, the student noticed the spoon became very warm. What is the most likely reason the spoon became warm?\nAnswer:Heat from the soup was transferred to the spoon.", "source": "arc_easy"}
{"text": "Question: Where does a landslide begin?\nAnswer:a mountain", "source": "arc_easy"}
{"text": "Question: Students are learning about the natural resources in Maryland. One group of students researches information about renewable natural resources in the state. The other group researches information about nonrenewable natural resources in the state. The resources the students investigate include plants, animals, soil, minerals, water, coal, and oil. Aluminum is a nonrenewable natural resource. Which of these methods of aluminum disposal is best for the environment?\nAnswer:recycling it", "source": "arc_easy"}
{"text": "Question: Which of the following keeps the planets in our solar system in orbit around the Sun?\nAnswer:gravitational force", "source": "arc_easy"}
{"text": "Question: Which human organ system primarily exchanges gases between the body and the atmosphere?\nAnswer:respiratory", "source": "arc_easy"}
{"text": "Question: Moving water was the most important factor in forming which of these?\nAnswer:the Grand Canyon", "source": "arc_easy"}
{"text": "Question: Which list contains only nonliving things?\nAnswer:water, rocks, sunlight", "source": "arc_easy"}
{"text": "Question: Which type of energy conversion occurs in a flashlight?\nAnswer:chemical to light", "source": "arc_easy"}
{"text": "Question: Rocks that contain fragments of bones, shells, and plant remains are most likely\nAnswer:sedimentary.", "source": "arc_easy"}
{"text": "Question: Which reaction is endothermic?\nAnswer:cold pack", "source": "arc_easy"}
{"text": "Question: Which property of water can cause a rock to break apart?\nAnswer:Water expanding as it freezes.", "source": "arc_easy"}
{"text": "Question: With a microscope, you see that an object has a cell wall, a chloroplast, and a nucleus. What is being observed?\nAnswer:a plant cell", "source": "arc_easy"}
{"text": "Question: Which instrument would be best to measure the volume of a liquid?\nAnswer:a graduated cylinder", "source": "arc_easy"}
{"text": "Question: Which part of an atom is involved in chemical reactions?\nAnswer:negatively-charged particles", "source": "arc_easy"}
{"text": "Question: Which tool is best used to collect information about the weather?\nAnswer:thermometer", "source": "arc_easy"}
{"text": "Question: Which of these characteristics best helps scientists classify organisms?\nAnswer:structure", "source": "arc_easy"}
{"text": "Question: Which resource is most likely found in large amounts in forest ecosystems?\nAnswer:wood", "source": "arc_easy"}
{"text": "Question: Which of the following best describes a role of mushrooms in ecosystems?\nAnswer:breaking down dead plant material", "source": "arc_easy"}
{"text": "Question: A gardener wants to increase the ability of garden soil to retain water. Which of these should the gardener add to the soil?\nAnswer:organic material", "source": "arc_easy"}
{"text": "Question: In the life cycle of a fly, which stage comes after the larval stage?\nAnswer:pupa", "source": "arc_easy"}
{"text": "Question: In which example could a thermometer be used to show that heat energy is being transferred?\nAnswer:A stove is used to boil water in a pan.", "source": "arc_easy"}
{"text": "Question: What is the most likely function of a turtle's hard shell?\nAnswer:provide protection", "source": "arc_easy"}
{"text": "Question: What is the main source of energy that causes water to evaporate from the surface of Earth?\nAnswer:sun", "source": "arc_easy"}
{"text": "Question: Which terms can be used to describe the properties of both a wave and a particle of light?\nAnswer:speed and frequency", "source": "arc_easy"}
{"text": "Question: To use energy from the Sun to power household appliances, the solar energy must be converted to\nAnswer:electrical energy.", "source": "arc_easy"}
{"text": "Question: The yellow-throated longclaw is a bird that lives on the dry savanna of Africa. It looks almost exactly like another bird, the western meadowlark of North America. Although the birds look very similar, they are not even in the same taxonomic family. Scientists think the birds look alike because the two species developed under similar environmental pressures, even though they developed thousands of miles apart. Which process does their development demonstrate?\nAnswer:convergent evolution", "source": "arc_easy"}
{"text": "Question: The reaction that releases energy for use by the cell occurs in which site?\nAnswer:mitochondrial membrane", "source": "arc_easy"}
{"text": "Question: Why do doctors suggest that people get a flu vaccine each year?\nAnswer:Viruses can mutate from year to year.", "source": "arc_easy"}
{"text": "Question: Which of the following events involves a consumer and producer in a food chain?\nAnswer:A deer eats a leaf.", "source": "arc_easy"}
{"text": "Question: The change from day to night on Earth can be explained by\nAnswer:the rotation of Earth.", "source": "arc_easy"}
{"text": "Question: Which part of a bicycle BEST moves in a circle?\nAnswer:Foot pedal", "source": "arc_easy"}
{"text": "Question: When animals use energy, what is always produced?\nAnswer:heat", "source": "arc_easy"}
{"text": "Question: Which type of rock is formed when hot lava cools?\nAnswer:igneous", "source": "arc_easy"}
{"text": "Question: Which environmental factor would most likely prevent an orange tree from surviving in the desert?\nAnswer:the lack of moisture", "source": "arc_easy"}
{"text": "Question: After a rainstorm, a big pile of rocks blocks part of a mountain road. Which event most likely caused the rocks to move onto the road?\nAnswer:a landslide", "source": "arc_easy"}
{"text": "Question: What would be the result of adding one proton to an atom?\nAnswer:the atomic number would change", "source": "arc_easy"}
{"text": "Question: What would be the best source to find information about DNA testing?\nAnswer:scientific journals", "source": "arc_easy"}
{"text": "Question: In what section of Earth do earthquakes happen?\nAnswer:crust", "source": "arc_easy"}
{"text": "Question: A complete fossil has been found of a type of bird that cannot be identified. What can most likely be determined about the bird from the fossil?\nAnswer:The bird existed at one time but is now extinct.", "source": "arc_easy"}
{"text": "Question: When large areas of the rainforests are cleared and burned, climate can be affected. Which best explains how rainforest destruction can contribute to the greenhouse effect?\nAnswer:by releasing carbon into the atmosphere", "source": "arc_easy"}
{"text": "Question: Which information is used in a station model?\nAnswer:wind direction in a particular point and time", "source": "arc_easy"}
{"text": "Question: Which part of a plant is most responsible for using energy from the Sun to produce food for the plant?\nAnswer:leaf", "source": "arc_easy"}
{"text": "Question: Which natural formation is the best example of the result of both constructive and destructive forces such as weathering, erosion, and deposition of sediment?\nAnswer:The Grand Canyon", "source": "arc_easy"}
{"text": "Question: Which characteristic helps a fox find food?\nAnswer:sense of smell", "source": "arc_easy"}
{"text": "Question: Tay-Sachs disease is a recessive genetic disorder. If only one gene is present, an individual is a carrier. What is the probability of two healthy Tay-Sachs carriers having a child that has the disease?\nAnswer:25%", "source": "arc_easy"}
{"text": "Question: Two identical lamps contain the same amount of different types of oil. They are allowed to burn until all the oil has been burned. Which measurement will best provide the total difference in chemical energy between the two oils?\nAnswer:time it took for lamps to use oil", "source": "arc_easy"}
{"text": "Question: Which disease is a result of abnormal cell division?\nAnswer:cancer", "source": "arc_easy"}
{"text": "Question: During which season of the year would a rabbit's fur be thickest?\nAnswer:winter", "source": "arc_easy"}
{"text": "Question: Which property of an element is determined by adding the number of protons and number of neutrons?\nAnswer:atomic mass", "source": "arc_easy"}
{"text": "Question: Which of these cycles takes 24 hours?\nAnswer:Earth rotating on its axis", "source": "arc_easy"}
{"text": "Question: Lemon juice turns litmus paper red, is corrosive and tastes sour. Lemon juice is classified as\nAnswer:an acid.", "source": "arc_easy"}
{"text": "Question: A child walks across a carpet and generates an electrical charge. The child will get a slight shock by touching a\nAnswer:metal doorknob.", "source": "arc_easy"}
{"text": "Question: Which animal eats only plants?\nAnswer:Rabbit", "source": "arc_easy"}
{"text": "Question: A newborn kangaroo has the ability to crawl into its mother's pouch to drink milk. This is an example of\nAnswer:an instinct.", "source": "arc_easy"}
{"text": "Question: Which characteristic is shared by Earth and the Moon?\nAnswer:an orbit created by the force of gravity", "source": "arc_easy"}
{"text": "Question: The Piedmont and Coastal Plains regions in Maryland produce crops such as corn, soybeans, wheat, tobacco, tomatoes, and apples. Which environmental factor most likely influences which crops are grown in these regions?\nAnswer:soil quality", "source": "arc_easy"}
{"text": "Question: Which organ system is responsible for the exchange of oxygen and carbon dioxide between the body and the environment?\nAnswer:respiratory", "source": "arc_easy"}
{"text": "Question: Which of these will always produce a magnetic field?\nAnswer:an electric current", "source": "arc_easy"}
{"text": "Question: The periodic table provides information about the atoms of different elements. Which is a characteristic of an atom determines what element it is?\nAnswer:number of protons", "source": "arc_easy"}
{"text": "Question: Joel made some measurements and recorded this data: Sample 1 - 45 mL Sample 2 - 15 mL Sample 3 - 30 mL Sample 4 - 20 mL Which of these tools would most likely have been used to obtain these measurements?\nAnswer:graduated cylinder", "source": "arc_easy"}
{"text": "Question: A teacher demonstrates a chemical reaction. A student observes that the test tube in which the reaction occurs becomes warm. What is the source of the thermal energy generated by the reaction?\nAnswer:energy stored in the reactants", "source": "arc_easy"}
{"text": "Question: Deer provide food for wolves. How does this relationship also benefit the deer herd?\nAnswer:by controlling the deer population", "source": "arc_easy"}
{"text": "Question: In what way does society benefit from research on diseases?\nAnswer:Many illnesses will be prevented or cured.", "source": "arc_easy"}
{"text": "Question: Which energy transformation takes place in a gasoline lawn mower?\nAnswer:chemical energy to mechanical energy", "source": "arc_easy"}
{"text": "Question: Which of the following can only be seen with a telescope?\nAnswer:the moon-like phases of Venus", "source": "arc_easy"}
{"text": "Question: The rocks that form most of the Sierra Nevada are granitic rocks. This means that the mountains were most likely formed by\nAnswer:volcanic activity.", "source": "arc_easy"}
{"text": "Question: In 1872, the United States created a national park called Yellowstone. The park includes more than two million acres in the three states of Idaho, Montana, and Wyoming. Which statement best explains why national parks have a positive effect on ecosystems?\nAnswer:National parks limit mining, logging, and hunting.", "source": "arc_easy"}
{"text": "Question: According to the endosymbiotic theory, double-membrane mitochondria originated as a result of some larger eukaryotic cells with flexible membranes engulfing smaller prokaryotic cells. Which of these explains where the outer layer of the double membrane of the mitochondria originated?\nAnswer:the plasma membrane of the eukaryotic host", "source": "arc_easy"}
{"text": "Question: Toni got a cut on her arm while playing in a softball game. A few weeks later, the cut was healed. Which process is most responsible for repairing the cut?\nAnswer:reproduction of skin cells", "source": "arc_easy"}
{"text": "Question: A pot of cold water was heated on a stove until the water boiled. Which of the following best explains why the water was able to boil?\nAnswer:The cold water absorbed heat from the pot.", "source": "arc_easy"}
{"text": "Question: A spring-fed stream forms a pond that contains watercress plants, minnows, and crayfish. The pond receives 5 hours of direct sunlight every day. Which of the following is an abiotic factor in this ecosystem?\nAnswer:the pond water", "source": "arc_easy"}
{"text": "Question: A modern theory of the origin of the universe proposes that the first atoms formed were primarily atoms of which element?\nAnswer:hydrogen", "source": "arc_easy"}
{"text": "Question: A star is a large astronomical body that\nAnswer:emits light.", "source": "arc_easy"}
{"text": "Question: What happens to water when it boils?\nAnswer:It changes into water vapor.", "source": "arc_easy"}
{"text": "Question: Ms. Bristol measured the mass of a closed beaker containing several ice cubes. The mass was 100 g. An hour later, after the ice cubes had melted, Ms. Bristol measured the mass of the beaker again. What was the mass of the beaker of water the second time?\nAnswer:100 g", "source": "arc_easy"}
{"text": "Question: A student has two solid samples of the same substance. Which property do the substances most likely have in common?\nAnswer:density", "source": "arc_easy"}
{"text": "Question: In which object does chemical energy most likely transform into electrical energy?\nAnswer:a flashlight", "source": "arc_easy"}
{"text": "Question: What is the mass number of an atom with 17 protons, 17 electrons, and 18 neutrons?\nAnswer:35", "source": "arc_easy"}
{"text": "Question: Some machines can remove the salt that is in seawater. How does removing salt from seawater most help people?\nAnswer:provides useable drinking water", "source": "arc_easy"}
{"text": "Question: Which body system is most affected by a disease that causes the bones to become weak and brittle?\nAnswer:skeletal", "source": "arc_easy"}
{"text": "Question: Why can a small fire be put out by placing a heavy blanket over it?\nAnswer:This keeps oxygen from reaching the fire.", "source": "arc_easy"}
{"text": "Question: There is a river at the base of Mount Tom. In the spring the water level is usually very high. In the summer it is lower. The higher level of water during the spring comes from\nAnswer:melting snow.", "source": "arc_easy"}
{"text": "Question: Earthquake waves are recorded by seismograph machines. What does an earthquake wave transmit?\nAnswer:energy", "source": "arc_easy"}
{"text": "Question: The snowshoe hare was once common in Maryland. In 1986, researchers in the state noted that the snowshoe hare was no longer found in Maryland. Which statement best explains why the snowshoe hare is no longer found in Maryland?\nAnswer:Housing developments have replaced fields.", "source": "arc_easy"}
{"text": "Question: In the initial stages of manned space exploration, scientists needed to address adequate nutrition to provide astronauts with energy throughout the mission. Which of these criteria could not be used when considering food and energy for astronauts during manned space flights?\nAnswer:history of space food", "source": "arc_easy"}
{"text": "Question: Which is the best example of evaporation?\nAnswer:a puddle drying in the sun", "source": "arc_easy"}
{"text": "Question: In a forest community, trees produce leaves that can be eaten by deer. The leaves also fall to the forest floor during autumn. Fungi break the leaves down into nutrients that enter the soil. What is the decomposer in this forest community?\nAnswer:the fungi", "source": "arc_easy"}
{"text": "Question: Compared to Earth, the Moon is\nAnswer:drier.", "source": "arc_easy"}
{"text": "Question: What process forms an image in a mirror?\nAnswer:reflecting light", "source": "arc_easy"}
{"text": "Question: Which is an example of a physical change?\nAnswer:ice melting", "source": "arc_easy"}
{"text": "Question: Which of the following describes an object that must have a net negative charge?\nAnswer:It contains more electrons than protons.", "source": "arc_easy"}
{"text": "Question: Rocks found on Earth are classified as sedimentary, metamorphic, or igneous based on\nAnswer:how the rocks were formed.", "source": "arc_easy"}
{"text": "Question: Which of the following is formed when two elements combine chemically?\nAnswer:a compound", "source": "arc_easy"}
{"text": "Question: Which of the following is the most important safety practice when using a rock hammer on a geology field trip?\nAnswer:wear goggles while breaking rocks", "source": "arc_easy"}
{"text": "Question: To which organ system do the esophagus, liver, pancreas, small intestine, and colon belong?\nAnswer:digestive system", "source": "arc_easy"}
{"text": "Question: When sodium hydroxide reacts with a copper nitrate solution, the reaction vessel needs to be kept on ice to slow down the reaction. What best describes this reaction?\nAnswer:an exothermic reaction that releases energy", "source": "arc_easy"}
{"text": "Question: Scientists measured the patterns of spectral lines given off by distant galaxies and concluded that almost all of these galaxies are moving away from Earth. What did the scientists observe directly?\nAnswer:a shift toward longer wavelengths of light", "source": "arc_easy"}
{"text": "Question: When a multicellular organism is damaged, it will repair itself as\nAnswer:the cells work together.", "source": "arc_easy"}
{"text": "Question: Genes are located on chromosomes which are composed of\nAnswer:DNA.", "source": "arc_easy"}
{"text": "Question: Which of the following best describes the number of chromosomes in a normal human liver cell?\nAnswer:23 pairs of chromosomes", "source": "arc_easy"}
{"text": "Question: A student measures the growth of a group of plants given different amounts of fertilizer. Which data display should the student use to compare the growth of the plants?\nAnswer:line graph", "source": "arc_easy"}
{"text": "Question: What is a large buildup of moving ice and snow called?\nAnswer:glacier", "source": "arc_easy"}
{"text": "Question: Which of these conditions would most likely be shown in the fossil record as a reason for mass extinctions?\nAnswer:falling sea levels and global cooling", "source": "arc_easy"}
{"text": "Question: One of the functions of a topographic map is to\nAnswer:show the surface features of an area.", "source": "arc_easy"}
{"text": "Question: Reptiles become more active as the day gets warmer. This is because\nAnswer:their body temperature changes with the environment.", "source": "arc_easy"}
{"text": "Question: Which scientific model could be used to predict the properties of an element?\nAnswer:Periodic Table", "source": "arc_easy"}
{"text": "Question: Some of the thermal structure of Earth is the result of a combination of chemical composition, temperature, and pressure. Which is a boundary that best demonstrates a contact point between layers having relatively the same temperature and chemical composition?\nAnswer:inner core and outer core", "source": "arc_easy"}
{"text": "Question: A hillside along a highway has exposed layers of undisturbed sedimentary rock. Which method would be best for scientists to use to determine the relative age of these sedimentary rock layers?\nAnswer:apply the law of superposition", "source": "arc_easy"}
{"text": "Question: What are petri dishes used for in a lab?\nAnswer:growing bacteria in a controlled setting", "source": "arc_easy"}
{"text": "Question: How do most fish get the oxygen they need to survive?\nAnswer:Using their gills, they take in oxygen that is dissolved in water.", "source": "arc_easy"}
{"text": "Question: Miranda's neighbors have an apple tree in their yard. What is the source of energy for the apple tree?\nAnswer:sunlight", "source": "arc_easy"}
{"text": "Question: Some types of trees are able to survive the heat of a forest fire. Which of the following characteristics would best help a tree survive a fire?\nAnswer:thick bark", "source": "arc_easy"}
{"text": "Question: Which of the following would most likely happen if grasses and shrubs were removed from a rural Massachusetts ecosystem?\nAnswer:There would be a decrease in food energy produced by the ecosystem.", "source": "arc_easy"}
{"text": "Question: In 2004, Maryland recycled more than 35% of all of the waste the state produced. Which of these benefits does recycling provide to Maryland?\nAnswer:less trash sent to landfills", "source": "arc_easy"}
{"text": "Question: A student finds a round, smooth pebble on a beach. Which action made the pebble smooth?\nAnswer:waves moving", "source": "arc_easy"}
{"text": "Question: The position of the liver in the circulatory system maximizes its ability to filter out harmful chemicals as soon as they enter the bloodstream. Blood travels to the liver from the\nAnswer:digestive system.", "source": "arc_easy"}
{"text": "Question: A student recorded the amount of rain that fell in one year in his city. What is the best way for him to organize his information?\nAnswer:graph", "source": "arc_easy"}
{"text": "Question: While Anna was testing a circuit, she dropped a light bulb. What is the safest thing Anna can do?\nAnswer:tell her teacher that she broke the bulb", "source": "arc_easy"}
{"text": "Question: Sugar is added to water and the mixture is stirred. Which observation is evidence that the sugar dissolved in the water?\nAnswer:Less sugar is visible.", "source": "arc_easy"}
{"text": "Question: The direction water flows in a river depends on\nAnswer:the slope of the land", "source": "arc_easy"}
{"text": "Question: A soccer player kicks a soccer ball across a field. Which factor has the most effect on the distance the soccer ball travels?\nAnswer:the force of the kick", "source": "arc_easy"}
{"text": "Question: Many cells have a nucleus that contains chromosomes. These chromosomes carry genes that are composed of\nAnswer:DNA molecules", "source": "arc_easy"}
{"text": "Question: Which items would best protect a group of students while investigating a forest ecosystem?\nAnswer:long pants and long-sleeved shirts", "source": "arc_easy"}
{"text": "Question: A student needs to find the mass of an atom. The numbers of which atomic particles determines the mass of the atom?\nAnswer:both its protons and neutrons", "source": "arc_easy"}
{"text": "Question: Which activity is necessary for humans to maintain good health?\nAnswer:resting", "source": "arc_easy"}
{"text": "Question: A student completes several tasks while making breakfast. During which task does the student make a solution?\nAnswer:adding sugar to tea", "source": "arc_easy"}
{"text": "Question: Which natural event can dry out plants and cause wildfires?\nAnswer:drought", "source": "arc_easy"}
{"text": "Question: Where would nitrogen most easily be found in the nitrogen cycle?\nAnswer:in animal waste", "source": "arc_easy"}
{"text": "Question: Before it rains water must collect in\nAnswer:clouds.", "source": "arc_easy"}
{"text": "Question: Which atmospheric phenomena are created by the interaction of charged particles with Earth's magnetosphere?\nAnswer:auroras", "source": "arc_easy"}
{"text": "Question: Which of these BEST describes the way a feather feels?\nAnswer:Soft", "source": "arc_easy"}
{"text": "Question: A tight metal lid on a jar of pickles may loosen when it has been held in hot water. This is because the hot water causes the\nAnswer:metal lid to expand more than the glass jar expands", "source": "arc_easy"}
{"text": "Question: A scientist reads about an experiment conducted by a researcher.The scientist conducts the same experiment and collects data but this data contradicts what was published by the researcher. What should the scientist do since the data from the two experiments is contradictory?\nAnswer:Repeat the experiment to check the data collected.", "source": "arc_easy"}
{"text": "Question: The organisms that convert solar energy and raw materials into food are\nAnswer:producers.", "source": "arc_easy"}
{"text": "Question: Large amounts of metals like iron and aluminum are found in\nAnswer:rocks", "source": "arc_easy"}
{"text": "Question: Which of these occurs if myosin fails to bind to actin during muscle contraction?\nAnswer:The muscle cells will remain relaxed.", "source": "arc_easy"}
{"text": "Question: How are cells able to produce the proteins required by certain conditions?\nAnswer:by expressing existing genes", "source": "arc_easy"}
{"text": "Question: An organism's cells include organelles and a cell wall. In which taxonomic group or groups might the organism be classified?\nAnswer:plants, fungi, or protists", "source": "arc_easy"}
{"text": "Question: Which of these structures produces male gametes in humans?\nAnswer:testes", "source": "arc_easy"}
{"text": "Question: The length of a year is equivalent to the time it takes for one\nAnswer:revolution of Earth around the Sun", "source": "arc_easy"}
{"text": "Question: Which of these organisms has cells with cell walls?\nAnswer:A pine tree", "source": "arc_easy"}
{"text": "Question: Which is the result of mitosis?\nAnswer:two identical nuclei", "source": "arc_easy"}
{"text": "Question: Which of these materials on the walls of a room would work best to keep sound from making an echo?\nAnswer:carpet", "source": "arc_easy"}
{"text": "Question: The starch and water molecules in potato cells are stored in what organelle?\nAnswer:vacuole", "source": "arc_easy"}
{"text": "Question: Which animals live part of their lives in water and part on land, and go through metamorphosis?\nAnswer:amphibians", "source": "arc_easy"}
{"text": "Question: A student puts two identical plants in the same type and amount of soil. She gives them the same amount of water. She puts one of these plants near a sunny window and the other in a dark room. This experiment tests how the plants respond to\nAnswer:light", "source": "arc_easy"}
{"text": "Question: Humans need food to grow and survive. Food that is not used immediately by the body for energy is\nAnswer:stored for future use", "source": "arc_easy"}
{"text": "Question: What structure surrounds the cell and regulates materials that enter and leave the cell?\nAnswer:cell membrane", "source": "arc_easy"}
{"text": "Question: In order for boulders to become sediments, the boulders must first be\nAnswer:weathered and eroded.", "source": "arc_easy"}
{"text": "Question: During which stage of an insect's life cycle does the female lay eggs?\nAnswer:adult", "source": "arc_easy"}
{"text": "Question: When a dog smells food and begins drooling, it is responding to an external stimulus. Which of these describes a response to an internal stimulus?\nAnswer:A person eats spoiled food and vomits.", "source": "arc_easy"}
{"text": "Question: Which is an example of melting?\nAnswer:Butter changing into liquid in a warm pan", "source": "arc_easy"}
{"text": "Question: Students perform an investigation designed to measure the daily growth of a bean plant. Which should the students do every day of this investigation?\nAnswer:record data", "source": "arc_easy"}
{"text": "Question: Ice cream in a bowl changed from solid to liquid in a few minutes. Which of the following most likely caused this change?\nAnswer:Heat was added to the ice cream.", "source": "arc_easy"}
{"text": "Question: The change in the use of one model of the solar system to the use of another model resulted in major changes in science and society. Which two scientists produced the earlier and later models, respectively?\nAnswer:Ptolemy and Copernicus", "source": "arc_easy"}
{"text": "Question: An atom with a +1 charge has\nAnswer:lost an electron.", "source": "arc_easy"}
{"text": "Question: Which is an example of a single-celled organism?\nAnswer:amoeba", "source": "arc_easy"}
{"text": "Question: The Great Ocean Conveyer ocean current system runs north through the Atlantic from the equatorial region. If this current got disrupted, North American and European climates would become\nAnswer:colder.", "source": "arc_easy"}
{"text": "Question: Which region of the Milky Way contains a population that consists mostly of old stars?\nAnswer:the halo", "source": "arc_easy"}
{"text": "Question: When a switch to a ceiling fan is turned on, electrical energy is being transformed into\nAnswer:mechanical energy.", "source": "arc_easy"}
{"text": "Question: An agricultural scientist, George Washington Carver, is most famous for his research on\nAnswer:peanuts.", "source": "arc_easy"}
{"text": "Question: A student pours a clear liquid from a test tube into a beaker with a clear liquid already in it and notices that the mixture turns pink. The student infers the two clear liquids are different. This inference is a result of\nAnswer:student observations.", "source": "arc_easy"}
{"text": "Question: In what leaf structure is photosynthetic tissue found?\nAnswer:mesophyll", "source": "arc_easy"}
{"text": "Question: The crude oil extracted today was formed millions of years ago from the fossilized remains of algae and other tiny marine organisms. Most parts of the organisms decomposed soon after they died. Which biomolecules decomposed more slowly and became the basis of crude oil?\nAnswer:fatty acids", "source": "arc_easy"}
{"text": "Question: Temperatures below freezing are expected overnight. What might be done to protect plants growing outside?\nAnswer:cover them", "source": "arc_easy"}
{"text": "Question: Prolonged exercise stimulates muscle cells to absorb sugar from the blood. This mechanism reduces stress placed on the body by signaling the body to produce\nAnswer:insulin.", "source": "arc_easy"}
{"text": "Question: Which geologic feature is evidence that the North American plate once collided with the Eurasian and African plates?\nAnswer:the Appalachian Mountains", "source": "arc_easy"}
{"text": "Question: During an experiment, a student reports that a liquid turned green when mixed with another liquid. This is an example of\nAnswer:an observation", "source": "arc_easy"}
{"text": "Question: Which of the following causes a chemical change?\nAnswer:lemon juice added to milk", "source": "arc_easy"}
{"text": "Question: Which human organ system exchanges gases with the environment?\nAnswer:respiratory", "source": "arc_easy"}
{"text": "Question: Improvements in geological observation technologies have made it easier for scientists to locate resources in Earth's crust. These technologies have allowed for an increase in availability of which resource?\nAnswer:fossil fuel", "source": "arc_easy"}
{"text": "Question: An engineer constructs a prototype from wood. Which of the following is the best tool for the engineer to use to make the prototype's surface smooth?\nAnswer:sandpaper", "source": "arc_easy"}
{"text": "Question: If left in the sunshine, water in an open jar will\nAnswer:evaporate.", "source": "arc_easy"}
{"text": "Question: In some locations, squirrels sleep for long periods of time during the winter months. Which of the following most likely causes these squirrels to sleep for long periods of time?\nAnswer:decrease in temperature", "source": "arc_easy"}
{"text": "Question: Which of the following helps the body to cool down?\nAnswer:sweating", "source": "arc_easy"}
{"text": "Question: The brown fur of the arctic hare turns white in winter. How does this color change most likely help the arctic hare?\nAnswer:It helps the animal hide from predators.", "source": "arc_easy"}
{"text": "Question: A group of students found metamorphic rocks near a campsite. The presence of metamorphic rocks is most likely evidence of\nAnswer:high pressure", "source": "arc_easy"}
{"text": "Question: As water vapor condenses into liquid, which of the following can be formed?\nAnswer:clouds", "source": "arc_easy"}
{"text": "Question: Which of these particles, when found in soil, contributes most to the water retention in soil?\nAnswer:clay", "source": "arc_easy"}
{"text": "Question: Which of the following forms of energy is released or absorbed in most chemical reactions?\nAnswer:heat energy", "source": "arc_easy"}
{"text": "Question: Which of these must occur for sediments to form new rock?\nAnswer:recrystallization", "source": "arc_easy"}
{"text": "Question: A student wants to find the most accurate account of a scientific discovery that took place within the past three months. In which of these sources should the student look?\nAnswer:science journals", "source": "arc_easy"}
{"text": "Question: What is taken in by the leaves of a tree so it can make its own food?\nAnswer:sunlight", "source": "arc_easy"}
{"text": "Question: Radio signal interruption sometimes causes a humming or buzzing sound. These sounds are most likely caused by\nAnswer:electromagnetic waves.", "source": "arc_easy"}
{"text": "Question: Students planned an investigation that included adding a quantity of vinegar to a small amount of baking soda. Which is the best tool to measure the volume of the liquid vinegar used in the investigation?\nAnswer:graduated cylinder", "source": "arc_easy"}
{"text": "Question: Garrett collected some large rocks from a stream near his home. He measured the rocks on a balance. When he records the mass of the rocks, which units should Garrett use?\nAnswer:kilograms", "source": "arc_easy"}
{"text": "Question: Which of the statements is the most accurate in describing the chemical equation shown below? 2H_{2}(g) + O_{2}(g) -> 2H_{2}O(g) + energy\nAnswer:Energy is released.", "source": "arc_easy"}
{"text": "Question: A female dog is having puppies. She has black fur, brown eyes, and a curly tail. She can sit, bark, and roll over on command. Which set of traits can the female dog's puppies inherit?\nAnswer:brown eyes, black fur", "source": "arc_easy"}
{"text": "Question: Scientists estimate that Maryland contains more than 850 million tons of coal. Coal is most commonly used to produce ___.\nAnswer:electricity", "source": "arc_easy"}
{"text": "Question: Large populations of tortoises inhabited the Galapagos Islands before humans. When humans settled on the islands and introduced goats, the number of tortoise declined. What is most likely the explanation for the decrease in the tortoise population?\nAnswer:Goats compete with tortoises for vegetation.", "source": "arc_easy"}
{"text": "Question: Hereditary information is transmitted from parents to offspring through\nAnswer:genes.", "source": "arc_easy"}
{"text": "Question: Which device converts kinetic energy into electrical energy?\nAnswer:generator", "source": "arc_easy"}
{"text": "Question: Which behavior is a learned behavior?\nAnswer:eating with a fork", "source": "arc_easy"}
{"text": "Question: The distance between the Sun and the next closest star, Proxima Centauri, is most accurately measured in\nAnswer:light years.", "source": "arc_easy"}
{"text": "Question: Which of these uses sound waves to locate underwater objects?\nAnswer:sonar", "source": "arc_easy"}
{"text": "Question: Paleontologists are scientists who study evidence of past life on Earth. Which method do paleontologists most likely use to determine the forms of life that existed millions of years ago?\nAnswer:examine fossils records", "source": "arc_easy"}
{"text": "Question: The temperature in a hot star is high enough to pull electrons away from atoms. What state of matter results from this process?\nAnswer:plasma", "source": "arc_easy"}
{"text": "Question: Which resource, abundant in Nevada, is nonrenewable?\nAnswer:copper", "source": "arc_easy"}
{"text": "Question: A student reaches one hand into a bag filled with smooth objects. The student feels the objects but does not look into the bag. Which property of the objects can the student most likely identify?\nAnswer:shape", "source": "arc_easy"}
{"text": "Question: An abiotic factor that most influences the organisms living in a salt marsh is\nAnswer:water.", "source": "arc_easy"}
{"text": "Question: When oil is burning, the reaction will\nAnswer:only release energy", "source": "arc_easy"}
{"text": "Question: Fourth graders are planning a roller-skate race. Which surface would be the best for this race?\nAnswer:blacktop", "source": "arc_easy"}
{"text": "Question: Protein is used by the human body to\nAnswer:repair cells.", "source": "arc_easy"}
{"text": "Question: Changes in the weather are important to people living in Alaska. Which two tools best help scientists to share information about weather?\nAnswer:radio and computer", "source": "arc_easy"}
{"text": "Question: Which outcome is most likely if a person consumes more Calories than needed for daily activities?\nAnswer:weight gain", "source": "arc_easy"}
{"text": "Question: In a mixture, a magnet is used to separate some particles from sand. The dark particles are most likely made of which element?\nAnswer:iron", "source": "arc_easy"}
{"text": "Question: A student tosses a ball into the air. Which force causes the ball to fall back to the ground?\nAnswer:gravity", "source": "arc_easy"}
{"text": "Question: The gravitational force between two objects depends on the distance between the objects and each object's\nAnswer:mass", "source": "arc_easy"}
{"text": "Question: Scientists who have studied global climate changes have found that the average temperature of Earth has risen. There has also been an increase in the accumulation of atmospheric greenhouse gases. What is the goal of the scientific community in collecting this type of data?\nAnswer:to understand how greenhouse gases are related to global warming", "source": "arc_easy"}
{"text": "Question: Paper chromatography is a process used to separate mixtures of substances into their components. The components are carried by a mobile phase through a stationary phase made of absorbent paper. An investigation analyzed a sample of black ink to determine its components.Which property allows the components to separate?\nAnswer:the solubility of the components in the mobile phase", "source": "arc_easy"}
{"text": "Question: In one area, a large source of prey for eagles is rabbits. If the number of rabbits suddenly decreases, what effect will it most likely have on the eagles?\nAnswer:Their numbers will decrease.", "source": "arc_easy"}
{"text": "Question: Moving water in a river is considered a renewable resource because it\nAnswer:can be recycled by nature over time", "source": "arc_easy"}
{"text": "Question: When studying planetary data, Jackie found some similarities and differences among the planets that make up the solar system. Which generalization is true about the orbits of the major planets in the solar system?\nAnswer:Planetary orbits are mostly elliptical in shape.", "source": "arc_easy"}
{"text": "Question: When nitrogen-rich runoff from farms enters a nearby farm, it causes abundant growth of algal mat on the pond surface. As a result, underwater plants in the pond begin to die. Identify the limiting factor that is most responsible for causing the underwater plants to die.\nAnswer:sunlight", "source": "arc_easy"}
{"text": "Question: What is the main source of energy for the water cycle?\nAnswer:the Sun", "source": "arc_easy"}
{"text": "Question: Which of the following properties of a substance is conserved during thermal expansion?\nAnswer:mass", "source": "arc_easy"}
{"text": "Question: Trees use narrow tubes to transport water upward. Which property of water allows the water to rise in these narrow tubes?\nAnswer:cohesion of molecules", "source": "arc_easy"}
{"text": "Question: Which pair together could cause a rainbow?\nAnswer:Sunshine and rain", "source": "arc_easy"}
{"text": "Question: The property of matter that resists changes in motion is called\nAnswer:inertia.", "source": "arc_easy"}
{"text": "Question: Monarch butterflies use milkweed plants during all of their life stages. Milkweed plants grow in open areas, such as grasslands and wetlands. They also often grow between row crops. Given this information, which of these biotechnologies would pose the greatest threat to monarch butterflies?\nAnswer:development of new herbicides", "source": "arc_easy"}
{"text": "Question: In the past, Native American Indians buried dead fish along with corn seeds. This technique was used because the decomposing dead fish would\nAnswer:provide nutrients for the growing corn plant", "source": "arc_easy"}
{"text": "Question: Earth is composed of layers of material with different properties. Which of the following is most likely to be in constant motion?\nAnswer:mantle", "source": "arc_easy"}
{"text": "Question: Which mechanism helps carbon to cycle from the atmosphere to living organisms?\nAnswer:photosynthesis", "source": "arc_easy"}
{"text": "Question: A city has an outbreak of a disease that affects an unusually large portion of its population at the same time. Which term best describes the outbreak?\nAnswer:epidemic", "source": "arc_easy"}
{"text": "Question: In which structure is the Sun located?\nAnswer:Milky Way Galaxy", "source": "arc_easy"}
{"text": "Question: Removing waste from the body is the primary function of which body system?\nAnswer:excretory", "source": "arc_easy"}
{"text": "Question: Which discovery revealed that the universe contains many structures composed of millions of stars?\nAnswer:galaxies", "source": "arc_easy"}
{"text": "Question: If a tall tree falls over in a crowded forest, which resource becomes available to the surrounding plants?\nAnswer:sunlight", "source": "arc_easy"}
{"text": "Question: What best describes the mantle of Earth?\nAnswer:the largest layer between the crust and outer core", "source": "arc_easy"}
{"text": "Question: When Javier exercises, his muscle cells need more oxygen. Which would help Javier's muscle cells receive more oxygen?\nAnswer:increasing the rate his heart beats", "source": "arc_easy"}
{"text": "Question: Which process has most likely occurred when new traits appear in a species?\nAnswer:genetic mutation", "source": "arc_easy"}
{"text": "Question: A patient visits the doctor for a checkup and is diagnosed with skin cancer. Which of the following is the most likely cause of this disease?\nAnswer:exposure to ultraviolet rays", "source": "arc_easy"}
{"text": "Question: Which of the following forms of energy can travel by vibrating particles of air?\nAnswer:sound", "source": "arc_easy"}
{"text": "Question: A chef uses a metal spoon to stir noodles cooking in a pan. After five minutes, she notices that the thermal energy from the pan has made the spoon\nAnswer:hot.", "source": "arc_easy"}
{"text": "Question: Which will most likely cause a decrease in predator populations?\nAnswer:a decrease in prey populations", "source": "arc_easy"}
{"text": "Question: A robin catches and eats a cricket. Which statement best describes the roles of each animal?\nAnswer:The robin is the predator and the cricket is the prey.", "source": "arc_easy"}
{"text": "Question: Hookworms live inside the intestines of dogs. As the dog eats, the hookworms consume partially digested food. As a result of this nutrient diversion, the dog can become malnourished and weakened. Which best describes the relationship between the hookworms and the dog?\nAnswer:a parasitic relationship", "source": "arc_easy"}
{"text": "Question: The prairie grass ecosystem once had a deep layer of topsoil which was protected by the grasses that covered it. Removal of these grasses for farmland is causing the soil to be eroded mainly by\nAnswer:wind and rain.", "source": "arc_easy"}
{"text": "Question: When the Northern Hemisphere is tilted toward the Sun, what season is occurring in Australia?\nAnswer:winter", "source": "arc_easy"}
{"text": "Question: Light waves are arranged in the electromagnetic spectrum by\nAnswer:wavelength and frequency.", "source": "arc_easy"}
{"text": "Question: In order to distinguish fact from opinion, conclusions in experiments should be\nAnswer:based on verifiable data.", "source": "arc_easy"}
{"text": "Question: Pumice is formed when lava from a volcano cools. Which rock type is pumice?\nAnswer:Igneous rock", "source": "arc_easy"}
{"text": "Question: The principle of uniformitarianism states that most of the landscape of Earth was formed slowly and over a long period of time. Which occurrence of Earth is least supported by this principle?\nAnswer:volcanic eruption", "source": "arc_easy"}
{"text": "Question: Selective breeding has resulted in plants that are resistant to pests and produce a higher yield of fruits and vegetables. Which of these is the most likely disadvantage that can result from this process?\nAnswer:decreased genetic diversity", "source": "arc_easy"}
{"text": "Question: A student measured the volume of water in a pan. The student boiled the water for thirty minutes and then measured the volume of the water again. The volume of water most likely\nAnswer:decreased", "source": "arc_easy"}
{"text": "Question: Lori owns a house next to the lake. She uses lots of fertilizer to keep her lawn green. Which impact could fertilizing her lawn have on the lake?\nAnswer:an increase in the algae population", "source": "arc_easy"}
{"text": "Question: To compare the hardness of different minerals, it would be BEST to find\nAnswer:which minerals scratch other minerals.", "source": "arc_easy"}
{"text": "Question: A house is built in a desert, where there is no electricity and very little wind. Which action could lead to operating the electrical appliances in the house that would cause the least amount of environmental pollution?\nAnswer:placing solar panels on the roof of the house", "source": "arc_easy"}
{"text": "Question: Students are learning about the natural resources in Maryland. One group of students researches information about renewable natural resources in the state. The other group researches information about nonrenewable natural resources in the state. The resources the students investigate include plants, animals, soil, minerals, water, coal, and oil. Which nonrenewable natural resource heats homes?\nAnswer:natural gas", "source": "arc_easy"}
{"text": "Question: Gregor Mendel was the first to show that organisms had traits that are passed on from parents to the next generation. In order for the scientific community to accept Mendel's discovery, others had to\nAnswer:duplicate the results of his experiments.", "source": "arc_easy"}
{"text": "Question: Alicia has lots of old bicycle parts. She wants to build something new with the parts. What is the first thing Alicia should do?\nAnswer:plan the new item", "source": "arc_easy"}
{"text": "Question: Which is a major organ of the nervous system?\nAnswer:brain", "source": "arc_easy"}
{"text": "Question: Some students were investigating the relationship between position, time, and speed. The students marked the initial position of a toy car. The students set the car into motion and marked the position of the car each second. Which of these are most appropriate for recording and analyzing the students' data?\nAnswer:a table and a line graph", "source": "arc_easy"}
{"text": "Question: If the number of trees significantly decreases, the atmosphere's level of which gas might significantly increase?\nAnswer:carbon dioxide", "source": "arc_easy"}
{"text": "Question: Which of the following is the best estimate of the number of stars in a typical galaxy?\nAnswer:billions", "source": "arc_easy"}
{"text": "Question: A company plants trees on a bare hillside. Which of these is the BEST reason for planting the trees?\nAnswer:The trees prevent soil from washing away.", "source": "arc_easy"}
{"text": "Question: Index fossils help scientists estimate the age of a rock because index fossil species only existed for a relatively short time. What happened to the species that are now used as index fossils?\nAnswer:They became extinct.", "source": "arc_easy"}
{"text": "Question: Feathers, wings, and the hollow bones of birds are examples of\nAnswer:adaptations for flight", "source": "arc_easy"}
{"text": "Question: A student climbs up a rocky mountain trail in Maine. She sees many small pieces of rock on the path. Which action most likely made the small pieces of rock?\nAnswer:ice breaking large rocks apart", "source": "arc_easy"}
{"text": "Question: Which of the following heat exchange processes involves the collision of particles?\nAnswer:conduction", "source": "arc_easy"}
{"text": "Question: The most effective way to show a change happening over time is to display your results using a\nAnswer:line graph.", "source": "arc_easy"}
{"text": "Question: The diet of a brown bear includes roots, grasses, berries, nuts, fish, insects, and mammals. Based on this description, in what category is a brown bear?\nAnswer:omnivore", "source": "arc_easy"}
{"text": "Question: A bracket fungus grows on a dead tree and breaks it down into chemical nutrients. What term best classifies the role of a bracket fungus in this ecosystem?\nAnswer:decomposer", "source": "arc_easy"}
{"text": "Question: The comet Shoemaker-Levy struck the planet Jupiter in July of 1994. The process of a comet striking a planet is an example of a net decrease in kinetic energy. Kinetic energy was ultimately converted into\nAnswer:thermal energy.", "source": "arc_easy"}
{"text": "Question: An earthquake in the Earth's crust under the ocean releases sound waves. Which statement accurately describes how the sound waves spread?\nAnswer:They spread in all directions away from their source.", "source": "arc_easy"}
{"text": "Question: Which provides the oldest evidence for oxygen accumulation in Earth's atmosphere?\nAnswer:the earliest sediments of oxidized rock", "source": "arc_easy"}
{"text": "Question: Louis Pasteur discovered that the bacteria in a substance can be killed by heating the substance for a short period of time. Which of these practices benefited most from Pasteur's discovery?\nAnswer:storing foods for longer periods of time", "source": "arc_easy"}
{"text": "Question: How do traits of animals such as ear shape, nose shape, and hair color most often get passed to offspring?\nAnswer:sexual reproduction", "source": "arc_easy"}
{"text": "Question: Why is the ozone content of the stratosphere important to living organisms?\nAnswer:Ozone absorbs ultraviolet radiation from the Sun.", "source": "arc_easy"}
{"text": "Question: If an environment becomes warmer and drier, the change that would most likely help a species adapt would be an increase in its\nAnswer:ability to store water.", "source": "arc_easy"}
{"text": "Question: Thousands of years ago, several species of large mammals existed in North America. These species became extinct not long after the first human settlement of North America. Which human activity most likely contributed to the extinction of these mammals?\nAnswer:hunting", "source": "arc_easy"}
{"text": "Question: Which of the following is an example of a behavioral adaptation?\nAnswer:migration of birds", "source": "arc_easy"}
{"text": "Question: Which two processes could result in the formation of high mountains with well-rounded peaks?\nAnswer:collision of crustal plates and erosion", "source": "arc_easy"}
{"text": "Question: The brown tree snake is a nonnative species found on the South Pacific island of Guam. The brown tree snake population in Guam is so large that it negatively affects the humans there. Which statement best explains why the brown tree snake has flourished in Guam?\nAnswer:There are no natural snake predators.", "source": "arc_easy"}
{"text": "Question: How are droughts always different from floods?\nAnswer:They have different amounts of water.", "source": "arc_easy"}
{"text": "Question: Which of the following is a harmful waste material that leaves the blood and travels through the lungs before leaving the body?\nAnswer:CO2.", "source": "arc_easy"}
{"text": "Question: How are a tree and grass alike?\nAnswer:Both have roots.", "source": "arc_easy"}
{"text": "Question: What organ system in the human body contains the pituitary gland, hypothalamus gland, and thyroid gland?\nAnswer:endocrine system", "source": "arc_easy"}
{"text": "Question: Which term describes an organism's ability to maintain a stable internal environment?\nAnswer:regulation", "source": "arc_easy"}
{"text": "Question: Which of the following can provide the human body with long-term immunity against some diseases?\nAnswer:vaccines", "source": "arc_easy"}
{"text": "Question: Which event is most likely to increase the genetic variation in a population of organisms?\nAnswer:increased immigration", "source": "arc_easy"}
{"text": "Question: Where would animals and plants be most affected by a flood?\nAnswer:low areas", "source": "arc_easy"}
{"text": "Question: Which seismic wave phenomenon, found at structural boundaries, allows scientists to interpret the interior structure of Earth?\nAnswer:refraction of waves", "source": "arc_easy"}
{"text": "Question: When ice melts, it becomes a\nAnswer:liquid.", "source": "arc_easy"}
{"text": "Question: Which combination of letters could be used as a chemical symbol for an element?\nAnswer:Dy", "source": "arc_easy"}
{"text": "Question: How is the stratosphere different from the troposphere?\nAnswer:The temperature of the stratosphere warms at higher altitude.", "source": "arc_easy"}
{"text": "Question: If a student gets a chemical splashed into an eye, what is the most appropriate first action to be taken?\nAnswer:flush the eye with water at an eyewash station", "source": "arc_easy"}
{"text": "Question: Which of the following best describes an advantage of using a mass production manufacturing system instead of a custom manufacturing system?\nAnswer:Products can be made at a lower cost.", "source": "arc_easy"}
{"text": "Question: Which adaptation allows a walrus to stay warm in cold water?\nAnswer:thick layer of blubber", "source": "arc_easy"}
{"text": "Question: Ninety-nine percent of the mass of an atom is located in\nAnswer:the nucleus.", "source": "arc_easy"}
{"text": "Question: Which of the following is a common renewable resource found in deserts?\nAnswer:solar energy", "source": "arc_easy"}
{"text": "Question: Beaver dams can cause floods. This statement shows how\nAnswer:animal behavior may affect the environment", "source": "arc_easy"}
{"text": "Question: A scientist crosses a red-flowered plant with a white-flowered plant, and all offspring have red flowers. What will most likely result if these red-flowered offspring are crossed with white-flowered plants?\nAnswer:The offspring will have either red or white flowers.", "source": "arc_easy"}
{"text": "Question: Genetically modified plants with new characteristics have been produced through genetic engineering methods. What impacts have resulted from the use of genetically modified plants?\nAnswer:increases in resistance to herbicides, insects, and viral diseases", "source": "arc_easy"}
{"text": "Question: Which best explains the importance of nitrogen in the cycling of energy and matter?\nAnswer:Nitrogen increases protein production in plants.", "source": "arc_easy"}
{"text": "Question: Which of these mixtures would be easiest to separate?\nAnswer:Fruit salad", "source": "arc_easy"}
{"text": "Question: If you wanted to be able to look at the stars, the planets, and the Moon more closely, what should you use?\nAnswer:Telescope", "source": "arc_easy"}
{"text": "Question: Which of the following is a correct food chain?\nAnswer:corn -> cow -> human", "source": "arc_easy"}
{"text": "Question: Which of these is directly formed as a result of weathering and erosion?\nAnswer:sediments", "source": "arc_easy"}
{"text": "Question: Most underground caves are formed by the action of water on\nAnswer:limestone", "source": "arc_easy"}
{"text": "Question: A group of students is taking a hike along a stream channel. One student picks up a rock from the stream and notices that the rock is very smooth and round. Which type of weathering most likely shaped the rock?\nAnswer:abrasion", "source": "arc_easy"}
{"text": "Question: Which of the following is most likely to make a rock crack and crumble?\nAnswer:water freezing in a crack in the rock", "source": "arc_easy"}
{"text": "Question: Which is the most likely reason why scientific theories change?\nAnswer:scientists make new observations", "source": "arc_easy"}
{"text": "Question: A plant produces tiny plants around the edges of its leaves. When these tiny plants fall to the ground, they take root and become new plants. This process is an example of\nAnswer:asexual reproduction", "source": "arc_easy"}
{"text": "Question: A function of a plant's roots is to\nAnswer:absorb water and minerals.", "source": "arc_easy"}
{"text": "Question: In order for sediments to become rock, the sediments are generally\nAnswer:compacted.", "source": "arc_easy"}
{"text": "Question: When bedrock in Massachusetts is examined, it often appears scraped and polished. Which of the following most likely caused the bedrock to appear scraped and polished?\nAnswer:glacial movement", "source": "arc_easy"}
{"text": "Question: Endothermic reactions are reactions that require more energy to start than they give off in the products. Which statement describes an endothermic reaction?\nAnswer:It absorbs heat energy and is cold to the touch.", "source": "arc_easy"}
{"text": "Question: Which pair of English and metric units has most nearly the same value?\nAnswer:liter and quart", "source": "arc_easy"}
{"text": "Question: Students are studying the classifications of stars and they learned that the majority of stars are similar to the Sun. What can the students conclude knowing that most of the stars in the galaxy are like the Sun?\nAnswer:Most of the stars are main sequence stars.", "source": "arc_easy"}
{"text": "Question: Mosquitoes have adapted to detect carbon dioxide using certain sensory nerves. Mosquitoes instinctually move toward greater concentrations of carbon dioxide. What is the importance of this adaptation?\nAnswer:It helps mosquitoes find food.", "source": "arc_easy"}
{"text": "Question: Which unit can be used to describe an object's length?\nAnswer:meters", "source": "arc_easy"}
{"text": "Question: Meteorologists categorize hurricanes based on the Saffir-Simpson scale. The scale measures the intensity and destructive potential of hurricanes. Which factor has the most significant effect on the strength of a hurricane?\nAnswer:the temperature of the water below the hurricane", "source": "arc_easy"}
{"text": "Question: Multicellular organisms grow in size by producing more\nAnswer:cells.", "source": "arc_easy"}
{"text": "Question: Which a molecular process found only in retroviruses?\nAnswer:reverse transcription", "source": "arc_easy"}
{"text": "Question: A group of students are observing a fish tank for a school assignment. The group is to share the observations with the class. Which statement about observations is true?\nAnswer:Observations should always be recorded.", "source": "arc_easy"}
{"text": "Question: Sodium bicarbonate (NaHCO_{3}) is commonly known as baking soda. Sodium bicarbonate is a white solid that can dissolve in water. Under the proper conditions, sodium bicarbonate can release carbon dioxide (CO_{2}) gas. Which of the following is not a physical property of sodium bicarbonate?\nAnswer:It releases carbon dioxide.", "source": "arc_easy"}
{"text": "Question: To help it survive, an organism has a capsule, endospore, and pili. To which group does this organism belong?\nAnswer:bacteria", "source": "arc_easy"}
{"text": "Question: What advantage is gained by using radio telescopes as opposed to optical telescopes?\nAnswer:ability to see through clouds and dust", "source": "arc_easy"}
{"text": "Question: The process by which organisms with favorable variations reproduce at higher rates than those without such variations is\nAnswer:natural selection.", "source": "arc_easy"}
{"text": "Question: Competition is most likely to occur between which two organisms?\nAnswer:grass and strawberry plants", "source": "arc_easy"}
{"text": "Question: Some animals, such as squirrels, may bury acorns. Which of the following is most likely to happen to the acorns after they have been buried?\nAnswer:The acorns will have a chance to sprout.", "source": "arc_easy"}
{"text": "Question: Why are most fossils found in sedimentary rocks?\nAnswer:Organisms can be preserved in sedimentary rock.", "source": "arc_easy"}
{"text": "Question: Which model is used by scientists to determine the properties of elements?\nAnswer:the Periodic Table", "source": "arc_easy"}
{"text": "Question: Life is more likely to be found on a planet whose atmosphere contains abundant\nAnswer:oxygen.", "source": "arc_easy"}
{"text": "Question: Approximately how long does Earth take to complete its orbit around the Sun?\nAnswer:one year", "source": "arc_easy"}
{"text": "Question: A student describes a substance as lacking a definite shape. The description also states that the particles of matter are close to each other but still able to flow past each other. Which type of substance is the student most likely describing?\nAnswer:liquid", "source": "arc_easy"}
{"text": "Question: Electron transport in mitochondria results in a chemiosmotic gradient of which particle across the mitochondrial membrane?\nAnswer:protons", "source": "arc_easy"}
{"text": "Question: At science conventions, scientists present their research, and members of the audience can discuss or ask questions about the research. The main value of these science conventions is that they allow scientists to\nAnswer:exchange their ideas.", "source": "arc_easy"}
{"text": "Question: When a boy stands in a field in the sunlight, he usually is able to see his\nAnswer:shadow", "source": "arc_easy"}
{"text": "Question: In the human body, which system functions primarily to defend the body against disease?\nAnswer:immune", "source": "arc_easy"}
{"text": "Question: The moon goes through phases as it revolves around Earth. During which phase of the moon would it be possible for a solar eclipse to occur?\nAnswer:new moon", "source": "arc_easy"}
{"text": "Question: Which of these is the most common result of greenhouse gases altering the atmosphere of Earth?\nAnswer:an increase in the air temperature", "source": "arc_easy"}
{"text": "Question: A student was taking notes while the teacher was discussing cells. Which of these is a statement that the teacher most likely made?\nAnswer:The shape of a cell depends upon its function.", "source": "arc_easy"}
{"text": "Question: What goal does taxonomy accomplish?\nAnswer:classifies living organisms into groups", "source": "arc_easy"}
{"text": "Question: The fusion reaction that fuels the Sun converts hydrogen into\nAnswer:helium.", "source": "arc_easy"}
{"text": "Question: The main function of hormones in the human body is to\nAnswer:regulate body functions", "source": "arc_easy"}
{"text": "Question: Which gas, when condensed into its liquid state in the atmosphere, forms clouds?\nAnswer:water vapor", "source": "arc_easy"}
{"text": "Question: Fertilizers added by farmers to the soil contain high amounts of nitrates. How do fertilizers affect the nitrogen cycle?\nAnswer:More nitrates are available for plants to absorb.", "source": "arc_easy"}
{"text": "Question: A scientist is comparing two body cells of a multicellular organism. Which of the following is most likely identical?\nAnswer:number of chromosomes", "source": "arc_easy"}
{"text": "Question: Organisms that consume wastes to obtain the nutrients they need to survive are classified as\nAnswer:decomposers", "source": "arc_easy"}
{"text": "Question: In the 1600s, Galileo Galilei studied the moons of Jupiter. What did Galileo do to make better observations?\nAnswer:made improvements to the telescope", "source": "arc_easy"}
{"text": "Question: Which of these provides the best evidence that Earth's crust is divided into tectonic plates?\nAnswer:the distribution of earthquakes on Earth's surface", "source": "arc_easy"}
{"text": "Question: What causes the soil in a flood plain to be generally rich in nutrients?\nAnswer:new soil deposited by the river", "source": "arc_easy"}
{"text": "Question: Which characteristic is common to all reptile species?\nAnswer:ectothermic (cold-blooded)", "source": "arc_easy"}
{"text": "Question: Scientists working for a company are testing a new medicine that they think will help heal damaged tissue. In which part of the company are the scientists working?\nAnswer:research", "source": "arc_easy"}
{"text": "Question: Most of Earth's surface is covered by\nAnswer:water", "source": "arc_easy"}
{"text": "Question: The chemical equation below shows reactants and products. 6CO_{2} + 12H_{2}O + light + enzymes -> C_{6}H_{12}O_{6} + 6O_{2} + 6H_{2}O Which statement is best supported by analyzing this equation?\nAnswer:The atoms rearrange in the chemical reaction so that C_{6}H_{12}O_{6}, glucose, is made.", "source": "arc_easy"}
{"text": "Question: In a desert environment, cactus wrens often build their nests in cholla cacti to avoid predators. This behavior does not hurt the cacti. Which type of relationship do cactus wrens and cholla cacti demonstrate?\nAnswer:commensalism", "source": "arc_easy"}
{"text": "Question: The Davis Mountains in West Texas used to be taller than they are now. Which of the following conditions most likely caused the mountains to become shorter over time?\nAnswer:Rain and wind", "source": "arc_easy"}
{"text": "Question: Photosynthesis is the process that converts carbon dioxide and water into\nAnswer:sugar and oxygen.", "source": "arc_easy"}
{"text": "Question: Which statement best describes the organization of the Periodic Table of the Elements?\nAnswer:Elements within a group have similar properties.", "source": "arc_easy"}
{"text": "Question: Signs in many stores and restaurants warn that microwaves are in use. What is the main reason for this warning?\nAnswer:Some people have pacemakers that may be affected by microwaves.", "source": "arc_easy"}
{"text": "Question: A scientist studies the remains of two extinct animals to learn more about how they lived. She determines that one animal was a carnivore and the other was an herbivore. Which of the following did the scientist most likely compare to make this conclusion?\nAnswer:the skull of the animals", "source": "arc_easy"}
{"text": "Question: Human actions can change the rate at which soil erodes. Which of the following would most likely slow the rate of soil erosion?\nAnswer:planting trees along cliffs", "source": "arc_easy"}
{"text": "Question: Which ability is the most useful for making observations?\nAnswer:senses", "source": "arc_easy"}
{"text": "Question: Sterling silver is a combination of silver and copper. Which of the following is also a combination of two or more metals?\nAnswer:brass.", "source": "arc_easy"}
{"text": "Question: The cows in a rancher's herd of cattle have been selectively bred to produce milk. Which of the following will cause the next generation of cows to receive the trait for producing large quantities of milk?\nAnswer:information in the cows' chromosomes", "source": "arc_easy"}
{"text": "Question: What is the correct explanation for why we have day and night on Earth?\nAnswer:Earth turns on its axis.", "source": "arc_easy"}
{"text": "Question: The body maintains equilibrium through a series of messages called a feedback mechanism. What organ releases hormones that maintain balanced glucose levels?\nAnswer:pancreas", "source": "arc_easy"}
{"text": "Question: Environmental organizations have asked businesses to take action to reduce waste. Which of the following changes could a business make in order to become more \u201cenvironmentally friendly\u201d?\nAnswer:Purchase only recycled paper and paper products.", "source": "arc_easy"}
{"text": "Question: The sound heard when a piano key is hit is caused by\nAnswer:vibration.", "source": "arc_easy"}
{"text": "Question: Wolves kill many elk every year and often attack old, sick, and injured members of a herd. Which of the following best describes the role of the wolves in the wolf-elk relationship?\nAnswer:predator", "source": "arc_easy"}
{"text": "Question: Which of the following is produced when sugar is digested in an animal cell?\nAnswer:carbon dioxide.", "source": "arc_easy"}
{"text": "Question: Which of these groups contains single-celled organisms?\nAnswer:fungus", "source": "arc_easy"}
{"text": "Question: Students studying rocks notice that in a particular location there are many igneous rocks that are very similar. This observation best supports which statement?\nAnswer:A nearby volcano had once been active.", "source": "arc_easy"}
{"text": "Question: Shale is a sedimentary rock that can be metamorphosed into slate by\nAnswer:increased pressure.", "source": "arc_easy"}
{"text": "Question: Plants need iron to grow. What parts of plants take in iron?\nAnswer:roots", "source": "arc_easy"}
{"text": "Question: Which of the following is the best observation of the refraction of light?\nAnswer:Viewing an object partially in water", "source": "arc_easy"}
{"text": "Question: A group of students investigated the effect of water temperature on the gill movements of goldfish. The students tested water temperatures from 20\u00b0C to 10\u00b0C at 2-degree intervals. The data showed that as water temperature decreased, the average number of gill movements per minute by the goldfish also decreased. Which type of display is BEST used to show this relationship?\nAnswer:a bar graph", "source": "arc_easy"}
{"text": "Question: The directions for making a protein\nAnswer:are carried by DNA.", "source": "arc_easy"}
{"text": "Question: Denise was driving east over a hill in the afternoon, shortly after a rain shower. Suddenly the sun broke through the clouds, and she saw a rainbow ahead of her. Which of the following made the rainbow possible?\nAnswer:Sunlight can be separated into all the colors of the rainbow.", "source": "arc_easy"}
{"text": "Question: Rhea is a moon of Saturn. Which of these facts about Rhea best indicates that it does not have a water cycle in which water changes state?\nAnswer:Its temperature is between -174\u00b0C and -220\u00b0C.", "source": "arc_easy"}
{"text": "Question: Which two factors determine the gravitational attraction between two objects?\nAnswer:mass and distance apart", "source": "arc_easy"}
{"text": "Question: When a red bull (RR) is bred with a white cow (WW), a roan calf (RW) is sometimes produced. If a roan bull (RW) is bred with a roan cow (RW), what is the most likely outcome of the offspring?\nAnswer:1 red, 1 white, and 2 roan", "source": "arc_easy"}
{"text": "Question: Which adaptive feature most helps a baby jaguar survive the first few weeks of life?\nAnswer:being born during spring months", "source": "arc_easy"}
{"text": "Question: Frank needs to move a box by sliding it across the floor. Which two factors will most strongly affect how hard Frank needs to push the box?\nAnswer:The total mass of the box and the friction between the box and the floor", "source": "arc_easy"}
{"text": "Question: An ocean, a forest, and a grassy meadow are each examples of a complete ecosystem. Complete ecosystems contain only\nAnswer:living and nonliving things.", "source": "arc_easy"}
{"text": "Question: The Great Basin in Nevada is characterized by uplifted, tilted blocks forming mountain ranges and downthrown blocks forming basins. What rock type is MOST likely to form in the basins?\nAnswer:sedimentary", "source": "arc_easy"}
{"text": "Question: As the human population increases, more fossil fuels are being used. The burning of fossil fuels produces greenhouse gases. How might humans reduce greenhouse gases?\nAnswer:Use renewable resources to generate power.", "source": "arc_easy"}
{"text": "Question: Which situation would most likely cause an object to travel in a circular motion?\nAnswer:one force acting on the object perpendicular to the direction of the motion", "source": "arc_easy"}
{"text": "Question: Which of the following does not give an example of how sparrows use resources in their environment to survive?\nAnswer:Sparrows use the sun for food.", "source": "arc_easy"}
{"text": "Question: Henry and Emily are building a tree house. Which tool should be used to measure the height of the door?\nAnswer:meter stick", "source": "arc_easy"}
{"text": "Question: Windy, cloudy, rainy, and cold are words that help describe\nAnswer:weather", "source": "arc_easy"}
{"text": "Question: All these statements concerning galaxies are accurate except\nAnswer:Most can be seen without a telescope.", "source": "arc_easy"}
{"text": "Question: Hydrogen gas and oxygen gas combine to form water. Which would be a more concise way of expressing what happens in this chemical reaction?\nAnswer:write a chemical equation", "source": "arc_easy"}
{"text": "Question: What safety equipment should be taken on all field trips?\nAnswer:first-aid kit", "source": "arc_easy"}
{"text": "Question: The surface gravity of Pluto is the weakest of the nine planets because Pluto\nAnswer:has the smallest mass.", "source": "arc_easy"}
{"text": "Question: If a class wants to measure the speed of a bicycle during an outdoor lab exercise, which two devices would be most useful?\nAnswer:stopwatch and tape measure", "source": "arc_easy"}
{"text": "Question: When sunlight shines on a plant, its leaves\nAnswer:make food.", "source": "arc_easy"}
{"text": "Question: Toads lay their eggs in ponds. Tadpoles hatch from the eggs and eat the plants floating in the pond. Which resource is most important for toads to survive?\nAnswer:water", "source": "arc_easy"}
{"text": "Question: Which structure surrounds and protects an animal cell?\nAnswer:Cell membrane", "source": "arc_easy"}
{"text": "Question: A ball is thrown straight up. Which statement best describes the motion of the ball while the ball is at the maximum height?\nAnswer:The velocity is zero, and the acceleration is constant.", "source": "arc_easy"}
{"text": "Question: Which organ is most responsible for oxygen entering the blood stream?\nAnswer:lungs", "source": "arc_easy"}
{"text": "Question: Why is a healthy diet important?\nAnswer:It supplies the body\u2019s needs for growth and energy.", "source": "arc_easy"}
{"text": "Question: In the human body, the breaking down of food into simple substances occurs in the\nAnswer:digestive system.", "source": "arc_easy"}
{"text": "Question: Which of the following processes is an important part of star formation?\nAnswer:nuclear fusion", "source": "arc_easy"}
{"text": "Question: Carlos puts a new battery into a radio. What does the battery supply to the radio that makes it turn on?\nAnswer:electricity", "source": "arc_easy"}
{"text": "Question: What may form as a direct result of a star collapsing?\nAnswer:supernova", "source": "arc_easy"}
{"text": "Question: A shoe manufacturer randomly selects 10% of the production from each shift. Each of these shoes is checked to ensure that it is correctly made. What is this process called?\nAnswer:quality control", "source": "arc_easy"}
{"text": "Question: Some materials are electrical conductors. Which material best conducts electricity?\nAnswer:copper", "source": "arc_easy"}
{"text": "Question: Angela wants to report daily weather conditions. In which unit should Angela record the air temperature?\nAnswer:degrees Celsius", "source": "arc_easy"}
{"text": "Question: Which organisms use the energy from the remains of dead animals and recycle the nutrients back into the environment?\nAnswer:decomposers", "source": "arc_easy"}
{"text": "Question: Which is the first step in a design process?\nAnswer:Describe the problem.", "source": "arc_easy"}
{"text": "Question: What type of chemical reaction occurs when the body breaks down fats and sugars that supply it with energy?\nAnswer:exothermic", "source": "arc_easy"}
{"text": "Question: Intense heat and pressure in Earth's crust can change sandstone into quartzite. During this metamorphosis, many properties of these rocks change. Which property of these rocks will most likely remain the same?\nAnswer:mass", "source": "arc_easy"}
{"text": "Question: How do decomposers obtain their food?\nAnswer:absorbing food from dead organisms", "source": "arc_easy"}
{"text": "Question: A ball on a cart is moving at a rate of 2 m/s. The cart suddenly stops and the ball continues to travel in the same direction at the same speed. This is an example of the\nAnswer:first law of motion.", "source": "arc_easy"}
{"text": "Question: Why is it important to have a large sample size in an investigation?\nAnswer:to increase the validity of the data", "source": "arc_easy"}
{"text": "Question: Burt used a spoon to stir soup that was cooking on his stove. Which spoon will stay the coolest while he stirs?\nAnswer:a wooden spoon", "source": "arc_easy"}
{"text": "Question: Which is a distinction between an epidemic and a pandemic?\nAnswer:the geographical area affected", "source": "arc_easy"}
{"text": "Question: When two bumper cars collide, some of the kinetic energy of the cars is transformed. Which form of energy is most likely formed as a result of this collision?\nAnswer:sound", "source": "arc_easy"}
{"text": "Question: Which statement describes all matter?\nAnswer:All matter is made up of atoms.", "source": "arc_easy"}
{"text": "Question: Carbon dioxide is removed from Earth's atmosphere by\nAnswer:plant photosynthesis.", "source": "arc_easy"}
{"text": "Question: A water company uses lab tests on the water supply before sending the water through pipes to people's homes. How do these lab tests help people?\nAnswer:by checking the water to make sure it is safe to drink", "source": "arc_easy"}
{"text": "Question: What safety rule is most important for students to follow when working with acids and bases?\nAnswer:put on safety goggles", "source": "arc_easy"}
{"text": "Question: A person in a dark room looking through a window can clearly see a person outside in the daylight. But a person outside cannot see the person inside. Why does this happen?\nAnswer:There is not enough light being reflected off the person in the room.", "source": "arc_easy"}
{"text": "Question: Many processes on Earth occur at or near tectonic plate boundaries. Which geological events are most common along tectonic plate boundaries?\nAnswer:earthquakes and volcanoes", "source": "arc_easy"}
{"text": "Question: Two pool (billiard) balls collide, causing each to move in a different direction. Eventually, both come to a stop. The most important factor in causing them to stop is\nAnswer:friction.", "source": "arc_easy"}
{"text": "Question: Which of these provides the best evidence that the environment of Earth has changed over millions of years?\nAnswer:marine fossils found in mountains", "source": "arc_easy"}
{"text": "Question: Which physical characteristic do some organisms have that helps them survive in the Arctic?\nAnswer:changing fur color to hide from predators", "source": "arc_easy"}
{"text": "Question: Which of the following occurs during photosynthesis?\nAnswer:CO2 and H2O are converted to carbohydrates.", "source": "arc_easy"}
{"text": "Question: A common characteristic of all living things is that they\nAnswer:are made of cells.", "source": "arc_easy"}
{"text": "Question: In the solar system, moons orbit planets. Which of these do planets orbit?\nAnswer:the Sun", "source": "arc_easy"}
{"text": "Question: Visible light is which type of wave?\nAnswer:electromagnetic", "source": "arc_easy"}
{"text": "Question: In some national parks, controlled fires are maintained by firefighters. Which of these is one of the major reasons for using controlled burns to maintain certain ecosystems?\nAnswer:to rid the forest floor of accumulated deadwood and brush", "source": "arc_easy"}
{"text": "Question: Which of the following actions is most likely part of a test to find the hardness of a mineral sample?\nAnswer:scratching the sample with a nail", "source": "arc_easy"}
{"text": "Question: In Costa Rica a small tree, the acacia, provides shelter and food for ants. The ants protect the acacia by removing other insects and vines that might harm it. Which term best describes the relationship between the acacia and the ants?\nAnswer:mutualism", "source": "arc_easy"}
{"text": "Question: A car skids along the road and smoke appears to be coming from under the tires. The heat that produces the smoke is caused by\nAnswer:friction", "source": "arc_easy"}
{"text": "Question: A glacier sometimes leaves behind large chunks of ice. What is left in the ground when these chunks of ice melt?\nAnswer:a kettle", "source": "arc_easy"}
{"text": "Question: A student uses a high-efficiency gasoline lawnmower to cut grass. The term \"high efficiency\" is used to indicate that the lawnmower\nAnswer:uses less energy than other lawnmowers.", "source": "arc_easy"}
{"text": "Question: Which example would result in new cells that are most different from the parent cells?\nAnswer:sperm and egg cells uniting to produce fertilized egg cells", "source": "arc_easy"}
{"text": "Question: A dog gets the energy it needs to run from ___.\nAnswer:food", "source": "arc_easy"}
{"text": "Question: Certain flowers will open for twelve hours and then close. Which stimulus do the flowers respond to when they open and then when they close for that time period?\nAnswer:light levels", "source": "arc_easy"}
{"text": "Question: Smoking harms the body in many ways. It is most harmful to which organ?\nAnswer:lung", "source": "arc_easy"}
{"text": "Question: In 1609, Galileo Galilei used lenses to construct the first telescope. His telescope allowed him to observe many objects in space. His invention of the telescope and the data he gathered directly contributed to the understanding that\nAnswer:the planets revolve around the Sun.", "source": "arc_easy"}
{"text": "Question: The energy obtained from food is measured in units called\nAnswer:Calories", "source": "arc_easy"}
{"text": "Question: Which part of the body works closely with the digestive system to transport nutrients to the cells?\nAnswer:blood", "source": "arc_easy"}
{"text": "Question: An example of a learned behavior is\nAnswer:driving a car", "source": "arc_easy"}
{"text": "Question: Iron oxides, such as rust, form when iron metal reacts with oxygen in the air. What are the chemical symbols for the two elements found in iron oxide?\nAnswer:Fe and O", "source": "arc_easy"}
{"text": "Question: When water evaporates from Earth's surface into the atmosphere, its molecules enter the gas state. What change in this gas causes molecules to condense into the small water droplets that form clouds?\nAnswer:The temperature is reduced.", "source": "arc_easy"}
{"text": "Question: Which process directly adds carbon into the atmosphere?\nAnswer:burning fossil fuels", "source": "arc_easy"}
{"text": "Question: Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis?\nAnswer:They have similar anatomies.", "source": "arc_easy"}
{"text": "Question: A particular organism is able to survive in an environment due to a thick layer of fat beneath its skin. In which situation would the layer of fat most likely be a survival advantage?\nAnswer:swimming in arctic waters", "source": "arc_easy"}