**Scientists have long noted that most animal species sleep at some point in their lives, despite the risks of doing so (vulnerability to predators). Some researchers now suggest that the persistence of sleep across species implies an advantage so significant that we have not yet fully identified it.** Which best COMPLETES the implication of these researchers?
ASleep is likely advantageous in ways yet to be discovered, given that it persists despite obvious risks
BSleep is universally understood
CAnimals should be discouraged from sleeping
DPredators benefit from animal sleep
Answer & Solution
Correct answer: A. Sleep is likely advantageous in ways yet to be discovered, given that it persists despite obvious risks
The researchers argue that the universality of sleep, despite the costs (vulnerability), implies there must be unknown benefits significant enough to outweigh the risks. Option B captures this inference. Others contradict or twist the argument.
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