Which of the following is true of circadian rhythms?
A) They are artificial inventions of timekeepers.
B) They are internally driven cycles.
C) They are sequences of events that occur once a month.
D) They occur on the same schedule regardless of the changes from day to night.
Answer: B
Rationale: Circadian rhythms are internally driven daily cycles of about 24 hours affecting physiological and behavioral processes. Light is the primary stimulus regulating our circadian rhythm and it tells us to sleep at night and stay awake for the day.
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