The human circadian rhythm that controls the awake versus sleepy cycle is not set in stone. Instead, external cues can cause an alteration in this rhythm. What is the primary cue used to alter or alternatively reinforce this circadian rhythm?

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    changes in the gravitational pull of the Earth
    changes in the Moons gravitational pull on the Earthh
    changes in levels of ultraviolet radiation that strikes the Earth
    changes in sunlight patterns (from dawn until dusk)
asked May 19, 2013 in Biology by anonymous
    

1 Answer

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changes in sunlight patterns (from dawn until dusk)
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)

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