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为什么空气中会有氧气？

空气中含有氧气是因为地球上的植物通过进行光合作用吸收二氧化碳并释放氧气。光合作用是植物利用阳光能量将二氧化碳与水转化为有机物质的过程，其中氧气是副产物之一。这样，大量的植物在地球上不断进行光合作用，将氧气释放到大气中，形成了空气中的氧气成分。人类和其他动物可以依靠呼吸将氧气吸入体内进行新陈代谢和能量产生。

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