Methanogenesis is characteristic of Archaea (and, according to some, plants as well). Why don't bacteria make methane? (Courtesy of David Lipson).
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(regarding Bill Martin's comment):I think the only coherant response I have is that, so far, the most extreme hyperthermophiles are all Archaea - bacteria can't do better than about 90oC, Archaea have been grown in the lab up to about 121oC.
Posted by: david lipson | December 04, 2007 at 09:50 AM