A phenomenon is described and an interpretation presented and rejected.

　　A generalization is made and supporting evidence is supplied and weighed.

　　A contradiction is noted and a resolution is suggested and then modified.

　　A series of observations is presented and explained in terms of the dominant theory.

　　A hypothesis is introduced and corroborated in the light of new evidence.

　　25. The passage supplies information for answering which of the following questions?

　　Why are Japanese starry flounder mostly left-eyed?

　　Why should the eye-sidedness in starry flounder be considered selectively neutral?

　　Why have biologists recently become interested in whether a characteristic is adaptive or selectively neutral?

　　How do the eyes in flatfish migrate?

　　How did Parker make his discoveries about the anatomy of optic nerves in flatfish?

　　26. Which of the following is most clearly similar to a cline as it is described in the second paragraph of the passage?

　　A vegetable market in which the various items are grouped according to place of origin

　　A wheat field in which different varieties of wheat are planted to yield a crop that will bring the maximum profit

　　A flower stall in which the various species of flowers are arranged according to their price

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