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Prominent among theories of the function of sleep is Meddis` immobilization hypothesis, which holds that sleep, rather than serving a restorative function, plays a protective role during times that animals cannot be usefully engaged in other activities. Meddis reasoned that animals not immediately threatened by predators would be safer if they passed the time sleeping.

However, that hypothesis cannot easily explain why one often observes a rebound in sleep time or intensity following a period of sleep deprivation. Neither does the hypothesis explain the existence of various states of sleep, which themselves may be associated with different functions.

In the context of the passage as a whole, the highlighted portion serves primarily to

Apresent the thinking that led scientists to qualify a widely accepted view
Bdescribe the basis on which a hypothesis was advanced
Cillustrate the kind of reasoning that is applied in a branch of science
Dexplain how a hypothesis can be tested empirically
Erelate the analysis that refined a tentative explanation

B显示答案

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