factors acting on the organism such as light, gravity, oxygen, temperature, predator-prey interactions, etc.

Endogenous factors

Endogenous rhythm

Biological clocks are an ancient and adaptive sense of time innate to an organism that allows them to anticipate environmental changes and cycles so they are able to physiologically and behaviorally respond to the expected change.

Evidence of circadian rhythms controlling DVM, metabolism, and even gene expression have been found in copepod species, Calanus finmarchicus.

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