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Biological rhythms are the periodic, predictable changes in the physiological, biochemical, and behavioral activities of organisms in response to environmental cycles. In non-chordates, these rhythms play a significant role in regulating activities such as feeding, reproduction, locomotion, and molting. These rhythms are generally classified based on their periodicity into circadian, ultradian, infradian, and tidal or lunar rhythms. Circadian rhythms are daily cycles that repeat approximately every 24 hours. They are widely observed in insects, crustaceans, and other non-chordates. For instance, in the cockroach *Periplaneta americana*, locomotor activity exhibits a circadian rhythm, showing periods of activity and rest synchronized with light and dark phases. _________ __________ __________ __________ ____.
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