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The least dense of the following planets is
Circadian Rhythms
Biological processes that display an endogenous, entrainable oscillation of about 24 hours, affecting various biological functions such as sleep-wake cycles.
Chronotypes
Chronotypes refer to the natural inclination of individuals towards being more active or alert at certain times of the day, affecting their sleep patterns and daily performance.
Zeitgebers
External or environmental cues, such as light and temperature, that help regulate biological rhythms, including the sleep-wake cycle.
Melatonin
A hormone produced by the pineal gland that regulates sleep and wakefulness.
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