Which of the following statements about circadian rhythms in humans is most accurate?
A) Circadian rhythms are apparently a uniquely human adaptation.
B) Circadian rhythms in humans tend to function on a 30-day cycle.
C) In the absence of natural light, humans show no indication of having circadian rhythms.
D) Circadian rhythms in humans actually appear to be regulated by several internal clocks.
Correct Answer:
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