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Life May Have Flourished on Earth as Early as 3.2 Billion Years Ago .
Feb 17, 2015. in South Africa and the University of Washington's Department of Earth & SpaceWe'll never find any direct evidence of land scum one cell thick, but thisIsotopic evidence for biological nitrogen fixation by molybdenum nitrogenase from 3.2 Gyr.Hubble Observes Barred Spiral Galaxy NGC 5398.Live Chat