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Our Sleep Rhythms Tend to Follow an Exact 24-Hour Day

Question 649

Multiple Choice

Our sleep rhythms tend to follow an exact 24-hour day because


A) the time of peak activity is invariant from person to person.
B) they are tied to external time markers like light and dark.
C) they have adapted to technological improvements made in the last century.
D) everyone needs at least eight hours of sleep every night.

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