Which Statement Is TRUE with Regard to the Duration of a Self-Generated

Which statement is TRUE with regard to the duration of a self-generated sleep/activity cycle?​

A) It is unreliable in most species, and dependably close to 24 hours only in primates.
B) ​It is longer if the organism is normally active in the dark.
C) ​It rarely varies from one individual to another, if at all.
D) It is highly consistent in a given individual in a given environment.

Correct Answer:

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