Final answer:
Circadian rhythms are biological responses in organisms that follow a 24-hour cycle based on light and darkness, regulated by internal clocks.
Explanation:
Circadian rhythms are innate physiological and behavioral responses in living organisms that follow a 24-hour cycle based on light and darkness patterns. These rhythms can drift out of phase but become entrained when exposed to alternating day and night cycles. The ability to respond to photoperiod depends on sensing light vs. dark and keeping time, all regulated by internal circadian clocks.
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https://brainly.com/question/35866163
