Methanogens are microorganisms that produce methane as a by-product of their metabolism. Most methanogens are found in the gut of ruminants (such as cows) as well as humans. Methanogens are also primarily responsible for the methane content in belching and flatulence.
Methanogens are also found in inhospitable environments such as the extreme depths of the ocean floor, under-sea volcanic vents and rocks present near the mid-ocean ridges. They have also been found under kilometres of ice as well as the hot dry desert soil.
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