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As the title says, what modification is needed, so a creature cannot fart while still being able to excrete their waste?

So creatures that can't excrete or doesn't have an anus like the Demodex is out of this question.

Is this possible?

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    $\begingroup$ mind the language you use, please. $\endgroup$ – L.Dutch - Reinstate Monica Nov 16 '19 at 5:57
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    $\begingroup$ Big difference between can't and doesn't here. It's possible in theory not to produce gas during digestion for example. Just say it doesn't, the rest are technical details about microorganisms and somehow I think it's not that kind of world. However, if a solid or liquid can fit through something, a gas can as well. $\endgroup$ – Raditz_35 Nov 16 '19 at 9:40
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    $\begingroup$ "Fart" isn't bad language. The NHS use it on their website, for heaven's sake. nhs.uk/conditions/Flatulence $\endgroup$ – SO failed us all... Bye... Nov 18 '19 at 14:23
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The modification to prevent an organism from eructating or breaking wind (thus, avoiding the f**t word) is simple. Its microbiome would have to be highly efficient and was capable of consuming metabolic products that would tend to be gases. Therefore, its alimentary system wouldn't be producing gases in sufficient qualities for them to be expelled from its fundament. It would still excrete matter, but this would be in the form of solids and liquids.

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    $\begingroup$ Metabolism not producing any gas would require a whole new biochemistry. Consuming the methane would produce CO2 and H2O... $\endgroup$ – L.Dutch - Reinstate Monica Nov 16 '19 at 8:38
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    $\begingroup$ @L.Dutch-ReinstateMonica CO2 is conveniently soluble. With a bit of an increase in muscle tone, this species could be the first to produce effervescent excrement. Failing that, a microbiome including components that produce suitable carbonates might be possible, though it does seem likely to be more calorifically intensive that just letting the gas out. $\endgroup$ – Starfish Prime Nov 16 '19 at 11:01
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    $\begingroup$ @L.Dutch-ReinstateMonica Not so new. "These bacteria are called methanotrophs, a name that literally means “fueled by methane.” Methanotrophs survive extreme conditions by eating methane. They house a unique protein called methane monooxygenase, or MMO" etc. Vide helix.northwestern.edu/blog/2017/09/bacteria-eat-methane - I was aware work was done to reduce methane emission in ruminants, but methanotrophs were still a surprise. $\endgroup$ – a4android Nov 16 '19 at 11:57
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    $\begingroup$ @StarfishPrime Depending on the metabolic pathways they could go all the way to carbohydrates from a methane feedstock. Perhaps. But carbonates are also a possibility. $\endgroup$ – a4android Nov 16 '19 at 12:00
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    $\begingroup$ @LiJun Never underestimate bacteria. They have the most diversity of any organisms on the planet. Plus several billion years of evolution to make them adaptable to effectively every ecological niche in the biosphere. $\endgroup$ – a4android Nov 16 '19 at 12:03
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I wonder if this creature may have some kind of gas absorbing gland or organ that prevents it before excretion or something - possibly even has another organ to release it in a different way - probably soundlessly (so maybe something that looks a little like a vent/gills?)

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