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

Question

Quizplus · Accepted Answer

Different sleep patterns exhibited by different animal species are likely the result of evolutionary adaptation to their specific ecological niches and environmental factors. For example, predators may need to remain alert for longer periods of time while prey animals may need to conserve energy and sleep more to avoid being vulnerable. These adaptations would have developed over time through natural selection.

In Answer to the Question of Why We Sleep, Some