What is the name of something some animals use to conserve water and elminate waste?
Options:
- (A) it keeps an organism warm
- (B) food and shelter
- (C) Exfoliation
- (D) an area swollen with pus
- (E) swamp vegetation
- (F) excretory structures
- (G) reusing materials
- (H) colder and wetter
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Let's think first: Some arthropods have special excretory structures. Terrestrial arthropods have an excretory system that conserves water and eliminates waste. Some animals have excretory structures that conserve water and elminate waste.... So the answer is [(F)]


_ lack respiratory and excretory systems.
Options:
- (A) graptolites
- (B) insects
- (C) ferns
- (D) barnacles
- (E) fossil fuels
- (F) Allergies
- (G) starfish
- (H) parasites
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Let's think first: Echinoderms lack respiratory and excretory systems. Echinoderms are represented by the starfish. Starfish lack respiratory and excretory systems.... So the answer is [(G)]


An animal's outer shell protects internal organs and:
Options:
- (A) food and shelter
- (B) epidermal
- (C) Epidermis
- (D) all matter
- (E) soft tissues
- (F) alveoli
- (G) warmth
- (H) layers of fat
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Let's think first: Bone provides protection for soft tissues and internal organs. Bones provide an outer shell to protect our internal organs. Soft tissues and internal organs need an outer shell for protection.... So the answer is [(E)]


Fertilization occurs when _ fuse.
Options:
- (A) fertile
- (B) sperm ducts
- (C) heat
- (D) eggs
- (E) seeds
- (F) gametes
- (G) pollen
- (H) ovaries
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Let's think first: Fertilization occurs when a sperm and an egg fuse. Sperm and eggs are cells known as gametes. Fertilization occurs when gametes fuse.... So the answer is [(F)]


Where do streams often get h20?
Options:
- (A) perspiration
- (B) at or near the margins
- (C) raising their temperature
- (D) the landscape
- (E) seeping out of a spring
- (F) cloudy and rainy weather
- (G) Inches or fractions of inches.
- (H) precipitation
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Let's think first: Streams may start with runoff or water seeping out of a spring. Water is everywhere H20. Streams often start with runoff or H20 seeping out of a spring.... So the answer is [(E)]


What can vaccines do?
Options:
- (A) cause euphoria
- (B) major threat to health
- (C) it protects them
- (D) protect plants
- (E) Keep someone from disease
- (F) cause a disease
- (G) cause a vasectomy
- (H) rapid expansion
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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Let's think first: Immunity results from immunization. Immunization with vaccine is effective. The ability of an organism to not be susceptible to a certain disease can result from vaccines.... So the answer is [(E)]