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Why Are Human Sleep Rhythms Tied to a 24-Hour Day

Question 13

Multiple Choice

Why are human sleep rhythms tied to a 24-hour day?


A) because the time of peak activity changes from person to person
B) because such rhythms are tied to external time markers like light and dark
C) because humans have adapted to technological improvements made in the last century
D) because people need at least eight hours of sleep at night

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