新gre逻辑阅读每日一练15_GRE阅读

　　nearly 100 percent left-eyed off the Japanese coast.获得更多gre考试咨询点击进入免费咨询顾问或联系QQ客服：800004500

　　Biologists call this kind of gradual variation over a certain

　　geographic rang a cline and interpret clines as strong

　　indications that the variation is adaptive, a

　　20 response to environmental differences. For the

　　starry flounder this interpretation implies that a

　　geometric difference is adaptive, that left-eyedness

　　in the Japanese starry flounder has been selected for, which provokes a

　　25 perplexing questions: what is the selective advantage in

　　having both eyes on one side rather than on the other?

　　The ease with which a fish can reverse the effect of the sidedness

　　of its eye asymmetry simply by turning

　　around has caused biologists to study internal anatomy,

　　30 especially the optic nerves, for the answer. In all flatfish

　　the optic nerves cross, so that the right optic nerve is joined

　　to the brains left side and vice versa. This crossing introduces

　　an asymmetry, as one optic nerve must

　　cross above or below the other. G. H. Parker

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