Tag: the three domains of life

Methanogens are microorganisms that produce methane as a metabolic byproduct in hypoxic conditions. They are prokaryotic and 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.

A facultative anaerobe is an organism that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to respiration if oxygen is absent.

Monera is the unicellular organism's having a prokaryotic cellular structure, these are microorganisms that evolve methane gas are prokaryotic and belong to the domain of archaea, methanogenic archaea are found in the digestive tracts of human beings along with ruminants, termites, and humans.