决定种群数量变化的因素主要是�出生率和死亡率�迁出和迁入�年龄组成和性别比例�生态系统的简单和复杂a ��b� �c ��d � � Template




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tomski决定种群数量变化的因素主要是�出生率和死亡率�迁出和迁入�年龄组成和性别比例�生态系统的简单和复杂a ��b� �c coloring