Tormod Posted October 26, 2005 Report Share Posted October 26, 2005 Scientists believe that oxygen first showed up in the atmosphere about 2.7 billion years ago. They think it was put there by a one-celled organism called "cyanobacteria," which had recently become the first living thing on Earth to make oxygen from water and sunlight. The rock record provides a good bit of evidence that this is so. But one of these rocks has just gotten a great deal more slippery, so to speak. Full story at Caltech Quote Link to comment Share on other sites More sharing options...
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