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G Cavallo
Bacteria were the first living beings to appear on our planet: the most ancient fossils available, all of them were procaryotic microorganisms, developed 4, 5 billion years ago. The paleomicrobiological studies made on that kind of fossils, which are by now several hundreds in each continent, proved bacteria to have constantly evolved and to have originated the modern Eubacteria as well as the Archebacteria and the Cianobacteria. These last appeared about 2 billion years ago and, having acquired the oxygen-type photosynthesis, have caused the formation of a large amount of organic material, afterwards used by the younger organisms, and have modified the atmosphere introducing oxygen in it and conditioning in this way the other living being's evolution...
January 1992: Giornale di Batteriologia, Virologia Ed Immunologia
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