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Archaea is one of three domains of organisms, the other two being Bacteria and Eukarya.  Archaeans are prokaryotic single-celled microorganisms.  These were the first life forms to appear on Earth after the phospholipid bubbles, and have lived from the Eoarchean era to today.
Halobacteria

Halobacteria

  Today they live in volcanic pools of sulphur and methane, soils, oceans, human intestines, and marshlands.
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