AP Biologyeasymcq1 pt
Circadian rhythms are
A.endogenous cycles of about 24 hours
B.cycles lasting exactly one year
C.responses to a single stimulus
D.learned behaviors only
Explanation
Core Concept
Internal clocks run roughly daily even without light cues and are entrained by day/night cycles — regulating sleep, hormone release, and plant movements.
Correct Answer
Aendogenous cycles of about 24 hours
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