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When you exhale (breathe out) you expel carbon dioxide. Where does the carbon in carbon dioxide come from?

User Elect
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1 Answer

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Answer: every atom of carbon in the exhaled carbon dioxide comes from food that was recently produced by photosynthesis. is.

Explanation: Everything we eat, save for a few inorganic components like salt, was in some way produced by photosynthesis

User BishopZ
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