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aerobic, CO2 → organic matter
CO2 fixation
CH2O → CO2
chemoorganotrophy with aerobic respiration
CH4 → CO2
aerobic methanotrophy
Organic matter → CH4
methanogenesis
Organic matter → H2/CO2
chemoorganotrophy anaerobic respiration or fermentation
CO2 → organic matter
anaerobic CO2 fixation
CH4 → CO2
anaerobic oxidation of methane (AOM)