Question: where would you expect to find members of domain archaea classified as methanogens

title: Methanogen
text: Methanogens are microorganisms that produce methane as a metabolic byproduct in anoxic conditions . They are prokaryotic and thus belong to the kingdom Monera , and they uniquely belong to the domain of archaea . They are common in wetlands , where they are responsible for marsh gas , and in the digestive tracts of animals such as ruminants and humans , where they are responsible for the methane content of belching in ruminants and flatulence in humans . In marine sediments the biological production of methane , also termed methanogenesis , is generally confined to where sulfates are depleted , below the top layers . Moreover , the methanogenic archaea populations play an indispensable role in anaerobic wastewater treatments . Others are extremophiles , found in environments such as hot springs and submarine hydrothermal vents as well as in the `` solid '' rock of the Earth 's crust , kilometers below the surface . 

Answer: answer: Methanogens are microorganisms that produce methane as a metabolic byproduct in anoxic conditions. They are common in wetlands and in the digestive tracts of animals such as ruminants and humans.  In marine sediments the biological production of methane is generally confined to where sulfates are depleted. The methanogenic archaea populations play an indispensable role in anaerobic wastewater treatments.