Methanobacterium is an

Methanobacterium is an anaerobic autotroph. Anaerobic means that it can live and grow in the absence of oxygen, and autotroph means that it can produce its own food using inorganic compounds as a carbon source, rather than relying on organic substances from other organisms. Methanobacterium belongs to a group of microorganisms known as methanogens, which produce methane gas as a byproduct of their metabolic processes.