Answer:
The natural cycle of physical, mental, and behavior changes that the body goes through in a 24-hour cycle. Circadian rhythms are mostly affected by light and darkness and are controlled by a small area in the middle of the brain. Circadian rhythm is sometimes called the “body's clock.”examples of circadian rhythms, such as the sleep-wake cycle, the body-temperature cycle, and the cycles in which a number of hormones are secreted. Infradian rhythms have a period of more than 24 hours. The menstrual cycle in women and the hibernation cycle in bears are two good example
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