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PHOTO: NEIL SIMPSON
PHOTO: NEIL SIMPSON

Endogenous clocks are usually synchronized with the outside day, by means of environmental stimulation. The ability of behavioural adaptation to environmental conditions confer selective advantages to the organisms that posses it, because it allows them to anticipate environmental events, such as the available light, behavioural changes of other bodies, etc. Examples of circadian rhythms are the production of melatonin, cortisol, urine output, rate of temperature and sleep-wake cycle.

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