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Origin of Life (Hadean
4.56 - 4.0 Gyr (Early Earth (started cooling,…
Origin of Life (Hadean
4.56 - 4.0 Gyr, Archean
4.0 - 2.5 Gyr, Indirect Evidence
, How did
life form?, Oldest Fossils
(no unequivocal cellular fossils in Archean))