humans breathe out
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humans breathe in oxygen and breathe out
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humans breathe out carbon dioxide, humans breathe out co2, humans breathe out, humans breathe out carbon, humans breathe out carbon monoxide or dioxide, what do humans breathe out, do humans breathe out carbon dioxide, do humans breathe out oxygen, do humans breathe out co2, humans breathe in oxygen and breathe out, what gas do humans breathe out, what do humans breathe out co2, how much carbon dioxide do humans breathe out