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Possible-Highway7898 t1_j1cccbv wrote

Reply to comment by trixayyyyy in Mars' ancient atmosphere may not have had much oxygen after all by pecika

Some farts contain methane. Not all.

Per Wikipedia: Not all humans produce flatus that contains methane. For example, in one study of the faeces of nine adults, only five of the samples contained archaea capable of producing methane

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