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Where do the oxygen atoms for the O2 gas that we breathe come from? Light Water Carbon dioxide Sugar
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Where do the oxygen atoms for the O2 gas that we breathe come from? Light Water Carbon dioxide Sugar

User RCohen
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If you are talking in a technical sense, then it comes from everything except sugar. However, if you can onyl choose one answer, the most accurate answer would be Carbon Dioxide.
User Sachaa
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