达尔文认为家养动物的许多品种是通过人工选择的结果如图是原鸡和几个品种的鸡.据图回答下问题1图示认为各种不同的鸡的共同祖先是原鸡.2 Template




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tomski达尔文认为家养动物的许多品种是通过人工选择的结果如图是原鸡和几个品种的鸡.据图回答下问题1图示认为各种不同的鸡的共同祖先是原鸡.2 coloring