What is the approximately 24-hour cycle in the physiological processes of so-called living beings?

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Circadian rhythm.
The circadian rhythm is a cycle of about 24 hours in the physiological processes of living creatures, including plants, animals, mushrooms, and cyanobacteria. In the strict sense, circadian rhythms are generated endogenously, although they can be modulated by external signals such as sunlight and temperature.

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