生物的物种既能保持基本稳定又能不断进化�展是因为生物具有下列哪种特性a生殖和�育b遗传和变异c生长现象d具有一定的结构——青夏教育 Template




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tomski生物的物种既能保持基本稳定又能不断进化�展是因为生物具有下列哪种特性a生殖和�育b遗传和变异c生长现象d具有一定的结构——青夏教育 coloring