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In some taxonomic schemes, one of the 5 kingdoms of life, comprising the prokaryotic Cyanophyta' (cyanobacteria) and ‘Schizomycophyta’ (other bacteria). Prokaryotes are currently placed into more fundamental categories (see archaea and Eubacteria). Bacteria are believed to have been the earliest forms of life on Earth, dating from at least 3300 Ma ago, while the first cyanobacteria appeared about 2600 Ma ago.

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