gre阅读练习每日一篇(四)_GRE阅读

　　 salt level of a river on a fishs migration

　　 humidity of an area on a cats shedding of its fur

　　 proximity of an owl on a lizards searching for food

　　18. Which of the following statements best describes the conclusion drawn by Brown

　　 A change in tide schedule is the primary influence on an oysters rhythms.

　　 A change in tide schedule may be an important exogenous influence on an oysters rhythms.

　　 Exogenous influences, such as a change in tide schedule, seldom affect an oysters rhythms.

　　 Endogenous influences have no effect on an oysters rhythms.

　　 Endogenous influences are the only influences on an oysters rhythms.

　　19. The passage suggests that Browns study was similar to Hamners in which of the following ways?

　　I. Both experimenters discovered that a new environment had a significant effect on an organisms behavior rhythms.

　　II. Both experimenters observed an organisms behavioral rhythms after the organism had been transported to a new environment.

　　III. Both experimenters knew an organisms rhythmic patterns in its original environment.

　　 I only

　　 II only

　　 I and II only

　　 II and III only

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