What do sea lions learn how to behave from?
Options:
- (A) exercise
- (B) Energy.
- (C) fish
- (D) Movement
- (E) Energy
- (F) playing
- (G) children
- (H) whales
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Let's think first: Playing is one way mammals and other animals learn how to behave. Sea lions are tactile mammals. Playing is one way sea lions learn how to behave.... So the answer is [(F)]

What die quickly if a stroke occurs?
Options:
- (A) a fish
- (B) animals
- (C) brain cells
- (D) organs
- (E) critical organs
- (F) protons
- (G) neutrons
- (H) bones
--
Let's think first: Brain cells die quickly if their oxygen supply is cut off. If the oxygen supply to the brain is cut off, a stroke can occur. Brain cells die quickly if a stroke occurs.... So the answer is [(C)]

What happens to bamboo throughout its life?
Options:
- (A) It helps them survive
- (B) it has cellular respiration
- (C) it dies and comes back to life
- (D) it continues to grow
- (E) it needs no water
- (F) it keeps an organism warm
- (G) flow of electrons
- (H) the body's largest organ
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Let's think first: Most plants continue to grow throughout their lives. Bamboos are vigorous, rugged plants. Bamboo continue to grow throughout their lives.... So the answer is [(D)]

What has a centralized nervous system with a brain?
Options:
- (A) Man
- (B) Birds
- (C) leeches
- (D) shark
- (E) evergreens
- (F) salmon
- (G) worms
- (H) pan
--
Let's think first: Fish have a centralized nervous system with a brain. Sharks are a type of fish. Sharks have a centralized nervous system with a brain.... So the answer is [(D)]

A response to what occurs when many muscles contract a little at once?
Options:
- (A) heat
- (B) cold
- (C) sweat
- (D) pain
- (E) forces
- (F) stress
- (G) comfort
- (H) motion
--
Let's think first: Shivering occurs when many muscles contract a little bit all at once. Another response to cold is shivering. A response to cold occurs when many muscles contract a little at once.... So the answer is [(B)]

Ribosomes are _.
Options:
- (A) Something to move
- (B) more abundant
- (C) interact
- (D) Most plants
- (E) hypertrophic
- (F) revolving
- (G) Energy.
- (H) fertile
--
Let's think first: Ribosomes are small organelles where proteins are made. All cell organelles are hypertrophic. Ribosomes are hypertrophic.... So the answer is [(E)]