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为什么动物会进化？

动物进化的原因是自然选择和适应环境的结果。在自然界中，动物种群中个体间的差异存在，使得一些个体对于环境更具生存优势。这些个体生存下来后会传递优势基因给后代，逐代累积，从而使整个种群对环境适应的能力提高。适应环境的变化是动物进化的驱动力之一。

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