Methanogens – Complete Species Profile Scientific Classification Domain: Archaea Kingdom: Euryarchaeota Group: Methanogens Common Name: Methane-producing archaea Type: Single-celled, prokaryotic microorganisms Overview Methanogens are microorganisms that produce methane gas (CH₄) as a by-product of their metabolism. They live in oxygen-free (anaerobic) environments and play a major role in the Earth’s carbon cycle. They are among the oldest life forms on Earth and are completely different from bacteria. Habitat (Where They Live) Methanogens thrive in environments with no oxygen, such as: Deep muddy swamps Wetlands and marshes Bottoms of lakes and ponds Inside the stomachs of cows, camels, sheep, and other ruminants Human intestines (in small numbers) Sewage treatment plants Hot springs Deep ocean hydrothermal vents Feeding Method Methanogens obtain energy by breaking down: Carbon dioxide (CO₂) Hydrogen gas (H₂) Acetate Methanol Their metabolic process produces methane gas a...
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