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Where does the carbon dioxide we exhale come from?
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Where does the carbon dioxide we exhale come from?

User Slight
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The air as there are many elements in the air
User BBonifield
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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. : )
User Ehz
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