Question

your turn! inferences many animals, including humans, must sleep, and sleep is known to have a role in everything from healing injuries to encoding information in long - term memory. but some scientists claim that, from an evolutionary standpoint, deep sleep for hours at a time leaves an animal so vulnerable that the known benefits of sleeping seem insufficient to explain why it became so widespread in the animal kingdom. these scientists therefore imply that ______ which choice most logically completes the text? choose 1 answer: a it is more important to understand how widespread prolonged deep sleep is than to understand its function. b prolonged deep sleep is likely advantageous in ways that have yet to be discovered. c many traits that provide significant benefits for an animal also likely pose risks to that animal. d most traits perform functions that are hard to understand from an evolutionary standpoint. answer explanation

Explanation:

The scientists note that the known benefits of deep - sleep don't seem to justify its widespread nature considering the vulnerability it causes. So, they imply that there must be other, undiscovered advantages to prolonged deep sleep that make it so common in the animal kingdom. Option A is about the importance of understanding prevalence over function which is not the main point. Option C is too general about traits in general, not specifically about deep - sleep. Option D is also too general about traits and not focused on deep - sleep's unique situation.

Answer:

B. prolonged deep sleep is likely advantageous in ways that have yet to be discovered.