I was looking for the answer ...

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I was looking for the answer that said anaerobic digestion.  Could not find it anywhere.  Some microbiologists schooled before 1950 were taught archaea were anaerobic. Most scientists today having their degrees during 1960 forwards know they are aerobic. Their technical name is microaerophilic Not having a disurnable cell wall they have no attachment sites. Thereby not being capable of being a pathogen, or a toxin. Basic info for high school. College courses get into the quantum mechanics functionality of the archaea and its pinnacle point in all evolution.