Biological Rhythms. Animal can predict the future?. 2 criteria for existence of a clock. Behavior rhythmic Rhythm persists without external cues done by isolation eclosion of fruit flies in dark. Biological Clock.
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“are internal timing mechanisms that involve both self-sustaining physiological pacemakers and cyclic synchronizer (zeitgerbers)”
Biological clocks for ALL of the earth’s natural cycle
falling asleep -- serotonin may induce drowsiness and sleep