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Question 1 (5 points)

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How can a seemingly valuable behavior evolve in one species but not in another? For example, primates can vomit but rodents cannot. Mention genes and natural selection in your answer.

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Question 2 (5 points)

Many people believe that we use only ten percent of our brains. Use evidence about the brain to evaluate such a claim.

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Question 3 (5 points)

How are neurotransmitters, membrane receptors and ion channels related?

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Question 4 (5 points)

What are three differences between rod and cone photoreceptors?

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Question 5 (5 points)

How would you describe the difference between what the retina does and what the striate cortex does?

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Question 6 (5 points)

Explain how hair cells transduce sound into elecrical potentials.

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