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| Description: The Atmosphere’s Oxygen Came from Photosynthetic Organisms Earth’s first free oxygen, produced by photosynthetic cyanobacteria (a), was trapped in banded iron formations Picture Stats: Views: 645 Filesize: 218.2kB Height: 1080 Width: 1122 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18967 |