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Date: 2008-02-10 18:34:07Geological history of Earth Chemistry Nature Dinosaurs Climate history Chalcogens Oxygen Mammal Reptile CretaceousPaleogene extinction event Evolution of mammals | CNN.com - Study: Oxygen helped mammals grow - Sep 29, 2005Add to Reading ListSource URL: memg.ocean.dal.caDownload Document from Source WebsiteFile Size: 18,87 KBShare Document on Facebook |