Which organisms belong to the precam Brian?
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Archaean Time (3800 to 2500 million years ago)
The first life is believed to be the Eubacteria (i.e., bacteria), single-celled prokaryotic organisms with no DNA-containing Nucleus. The most prevalent theory is that the Eubacteria are ancestral to the Archaea, only identified as a distinct domain of life in the 1970's.
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microscopic bacteria
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