What involves a sperm and egg fusing to form a diploid zygote?
Options:
- (A) Leptospirosis
- (B) produce offspring
- (C) allow growth
- (D) sexual reproduction
- (E) metabolic reaction
- (F) peachleaf willow
- (G) rapid expansion
- (H) Plant reproduction
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Let's think first: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Sexual reproduction requires formation of gametes, followed by fertilization. Sexual reproduction involves a sperm and egg fusing to form a diploid zygote.... So the answer is [(D)]


What kind of animal sometimes gets hiccups?
Options:
- (A) mammals
- (B) fur seals
- (C) fish
- (D) goats
- (E) humans
- (F) insects
- (G) worms
- (H) dogs
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Let's think first: Mammals breathe with the help of a diaphragm. Hiccups are a result of spasms of the diaphragm. Mammals sometimes get hiccups.... So the answer is [(A)]


What kind of animal doesn't have a centralized nervous system?
Options:
- (A) dog
- (B) mammals
- (C) cows
- (D) bird
- (E) human
- (F) elephants
- (G) starfish
- (H) a fish
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Let's think first: Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system.... So the answer is [(G)]


When cells start to divide uncontrollablly, they may form a what?
Options:
- (A) anemia
- (B) tissue
- (C) fever
- (D) cell
- (E) organ
- (F) fibroid
- (G) acid rain
- (H) illness
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Let's think first: Cells that divide uncontrollably may form a tumor, or abnormal mass of cells. For example, a fibroid is a tumor, a wart is a tumor, and cancers are tumors. Cells that divide uncontrollably may form a fibroid.... So the answer is [(F)]


What tells a cell what to do?
Options:
- (A) breathe
- (B) alleles
- (C) Energy
- (D) voltage
- (E) fever
- (F) genes
- (G) nerves
- (H) state
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Let's think first: Molecules of DNA are encoded with instructions that tell cells what to do. Genes are parts of DNA molecules. Genes are instructions that tell cells what to do.... So the answer is [(F)]


Running water is able to do what to minerals and oxygen?
Options:
- (A) evaporation
- (B) dissolve them
- (C) reducing acid rain
- (D) recycling
- (E) clean them
- (F) separate them
- (G) hydration
- (H) cool them
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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: Running water is better able to dissolve oxygen and nutrients than standing water. Mineral nutrients are interrelated. Running water is better able to dissolve oxygen and minerals than standing water.... So the answer is [(B)]