下列关于种群和物种的描述正确的是a.一个物种只有一个种群 b.当外来物种侵入到一个新的环境时其种群数量增长规律都是s型曲线 c.当外来物种 Template




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tomski下列关于种群和物种的描述正确的是a.一个物种只有一个种群 b.当外来物种侵入到一个新的环境时其种群数量增长规律都是s型曲线 c.当外来物种 coloring