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The prokaryote cell represents the simplest of organisation of , in which the genetic material () is not gathered together in a , but distributed throughout the whole cell. Prokaryotes were the earliest life forms on Earth, and they still constitute the bulk of the of life on Earth. The prokaryotes have been on earth for at least 3.85 bya.
There are of life that have or had a prokaryotic grade of organisation: (Archaeobacteria, which have an anaerobic metabolism), ("true" bacteria and blue-green algae), and the hypothetical organism (which, it is believed, entered into a symbiotic relationship with several different prokaryote species to form the first .
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