Where would you find methanogens, which can function only in the absence of oxygen?

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Methanogens are a group of organisms classified under the archeae and they produce methane as their metabolic byproduct. They can function only in anoxic conditions. ie., environment devoid of oxygen.

Usually they are found in wetlands or in the digestive tracts of humans or ruminants. In wetlands, their produce the marsh gas or methane. In the digestive tracts where they are found, they are responsible for the presence of methane in the belching of ruminants or flatulence of humans.

They are very sensitive anaerobes and can be really affected by the presence of oxygen, even at trace levels. As such they play a vital role in strictly anaerobic conditions to remove excess hydrogen and other fermentation products by using them up along with CO2 and releasing methane.

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