Oxygen may have been used and produced by marine creatures millions of years before it accumulated in the Earth's atmosphere, according to U.S. scientists.
Source: http://www.cosmosmagazine.com/news/4599/an-early-birth-date-oxygen
Ehrinn Cummings Elena Lyons Elisabeth Röhm Elisha Cuthbert Eliza Dushku Emilie de Ravin Emma Heming
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