Animals Exhibit Daily Rhythms in Their Behavior and Physiology

Animals exhibit daily rhythms in their behavior and physiology. Which of the following statements about circadian rhythms is false?

A) In mammals, the master circadian "clock" is located in the suprachiasmatic nuclei of the brain.
B) A circadian clock can be entrained by environmental cues.
C) Free-running circadian clocks are seldom exactly 24 hours long.
D) Genetic mutations can cause changes in the length of the free-running circadian clock.
E) Animals that are active at night do not display circadian rhythms.

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