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The temperature at which a liquid freezes is
Sleep
A naturally occurring condition of the mind and body where consciousness is altered, sensory activities are largely reduced, and almost all voluntary muscles are inhibited.
Circadian Rhythms
Biological processes that display an endogenous, entrainable oscillation of about 24 hours, affecting various physiological processes in living organisms.
Melatonin
A hormone produced by the pineal gland that regulates sleep and wakefulness.
Hormone
A chemical substance produced in the body that controls and regulates the activity of certain cells or organs.
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