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Unformatted text preview: light), chemotaxis (reaction to chemicals), and magnetotaxis (reaction to magnetism). Movement toward a stimulus is called positive taxis and movement away from a stimulus is called negative taxis. Circadian rhythms and other cyclical behaviors are more complex examples of behavior tuned to the environment. In general, cyclical behaviors are regulated by endogenous time-keeping mechanisms, called biological clocks, which are in turn regulated by external environmental stimuli that act to set the internal clock. Such stimuli are known as Zeitgebers and can include patterns of light and darkness and temperature variations....
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This note was uploaded on 01/27/2012 for the course BIOLOGY BSC1005 taught by Professor Rodriguez during the Winter '09 term at Broward College.
- Winter '09