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In Answer to the Question of Why We Sleep, Some

Question 423

Multiple Choice

In answer to the question of why we sleep, some researchers have concluded that different sleep patterns exhibited by different animal species, including humans, are the result of


A) variations in levels of neurotransmitters such as melatonin.
B) evolutionary adaptation.
C) variations in light levels at different latitudes
D) differences in the size of the suprachiasmatic nucleus

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