摘要: Abstract Microfossil finds have been firmly established at about 3.5 Ga (giga annee=109 years), but no rocks older than 4.0 demonstrated, leaving the history of first 0.6 missing. This gap has filled by models solar system. The origin ocean, atmosphere, and much crustal material apparently lies in a heavy rain comets, subsequent to catastrophic Moon-forming event. earliest microfossils are those Apex chert Australia, old. `Prebiotic' simulations possible biochemistry made some progress recent years, many obstacles remain, there is agreement as course development. `ribose nucleic acid (RNA) World', aboriginal `clay genes', catalysis on iron-sulfide precipitates not ruled out. search for `last common ancestor' reached point between Bacteria Archaea. It that this organism may thermophile, similar modern hot spring organisms. But it likely an autotroph, late development after true life. Even more speculative suggestions origins metabolic sequences, particular genetic code. Since all organisms share code (and other things), had be long during blank period Earth history.
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