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.
Answer: D
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