练习7中第11题 For the following question, consider each of the choices separately and select all that apply 11. The author would be most likely to agree with which of the following statements about left-eyedness and right-eyedness in the starry flounder? □A They are adaptive variations by the starry flounder to environmental differences. □B They do not seem to give obvious selective advantages to the starry flounder. □C They occur in different proportions in different locations. 为什么不选A 这不是有原话么？ 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.求解释！
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发表于 2012-12-3 09:21:33
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