The large between-species differences in sleep time suggest that sleep

A) improves cognitive function.
B) improves emotional function.
C) serves a higher-order cognitive function.
D) is not necessarily needed in large quantities.
E) both A and C

Answer: D

Psychology

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Indicate whether this statement is true or false.

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a. The categorical self b. The objective self c. The existential self d. The permanent self

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