用达尔文进化观点分析在工业污染区中深色桦尺蛾较多非工业污染区中浅色桦尺蛾较多.产生这种现象的原因是a人工选择的结果b自然选择的结果c Template




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tomski用达尔文进化观点分析在工业污染区中深色桦尺蛾较多非工业污染区中浅色桦尺蛾较多.产生这种现象的原因是a人工选择的结果b自然选择的结果c coloring