biorhythm by Encyclopedia
Submitted: Fri Oct 15 2004
CT: Biorhythm: biorhythm by Encyclopedia
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or biological rhythm, cyclic pattern of changes in physiology or in activity of living organisms, often synchronized with daily, monthly, or yearly environmental changes. Rhythms that vary according to the time of day (circadian rhythms), in part a response to daylight or dark, include the opening and closing of flowers and the nighttime increase in activity of nocturnal animals.