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2 July, 15:32

Where does the carbon dioxide we exhale come from?

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  1. 2 July, 17:08
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    The air as there are many elements in the air
  2. 2 July, 17:49
    0
    Well it does come from the air, but if you look into it a bit further, it comes from the decomposition of organisms, from the fossil fuels emitted off factories, and the exhalation of other animal life. : )
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