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Humans and almost all organisms have symbiotic or non-symbiotic bacteria throughout the alimentary canal. This is due to the indigestibility of cellulose found abundant in plant material. Because of the way cellulose (fiber) is bonded, very few animals have the enzymes to digest it. The bacteria in the small intestine of a human, such as E. coli, are able to digest some of the organic material that we are not able to.

One of the by-products of their digestion (among other vitamins minerals) is hydrogen sulfide and methane which is expelled via the low end of the alimentary canal. These gases are what we identify as fetid odors.

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