Words to Describe methanogens

How methanogens often is described ("________ methanogens")

• secondary
• autotrophic
• archaeal
• symbiotic
• certain
• most
• many
• halophilic
• several
• anaerobic
• psychrophilic
• viable
• shaped
• few
• growing
• rumen
• endosymbiotic
• thermophilic
• consuming
• utilizing
• oxidizing
• hyperthermophilic
• mesophilic
• ruminal
• using
• living
• different
• other