掌握了gre阅读里的长难句,到了实战演习的时候了。gre阅读练习每日一篇帮助gre考生循序渐进地进行练习和总结。希望gre考生在进行gre阅读练习时,也按着考试时候的时间规定自己的练习,这样才能有效果。
Although scientists observe that an organisms behavior falls into rhythmic patterns, they disagree about how these patterns are affected when the organism is transported to a new environment. One experimenter, Brown, brought oysters from Connecticut waters to Illinois waters. She noted that the oysters initially opened their shells widest when it was high tide in Connecticut, but that after fourteen days their rhythms had adapted to the tide schedule in Illinois. Although she could not posit an unequivocal causal relationship between behavior and environmental change, Brown concluded that a change in tide schedule is one of several possible exogenous influences on the oysters rhythms. Another experimenter, Hamner, however, discovered that hamsters from California maintain their original rhythms even at the South Pole. He concluded that endogenous influences seem to affect an organisms rhythmic behavior.
17. All of the following could be considered examples of exogenous influences on an organism EXCEPT the influence of the
level of a hormone on a field mouses readiness for mating
temperature of a region on a bears hibernation
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