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为什么金鱼可以在没有氧气的水里生存？

金鱼可以在没有氧气的水里生存是因为它们具有特殊的呼吸方式。金鱼的鳃能够提取水中的氧气，而不需要通过肺部吸入空气。当金鱼在水中呼吸时，鳃的薄壁上的微细血管会吸收水中的氧气，同时排出体内产生的二氧化碳。这种呼吸适应机制使得金鱼能够在相对缺氧的水中生存。

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