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What is the evolutionary-biology rationale, if any, for the pungent aroma of human flatulence?

Question:

What is the evolutionary-biology rationale, if any, for the pungent aroma of human flatulence?

Flatulence:

Humans, and other animals, produce flatulence. Flatulence is an unpleasant result of digestion. No flatulence has a pleasant aroma. It seems like a nuisance that we'd rather do without.

Answer and Explanation:

The smell of flatulence is determined by what we eat. The digestion of our food produces smelly gas. That's pretty much all there is to it.

If we try...

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