methanogen

Noun
  1. Archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane;
    A source of natural gas (synset 101350499)
    is a type of: archaebacteria, archaebacterium, archaeobacteria, archeobacteria - considered ancient life forms that evolved separately from bacteria and blue-green algae

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