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Recent Event Highlights: Early multi-cell organisms, Early shelled organisms and large numbers of marine fossils, and 2 more...
Created by DomnicSmith
on Apr 14, 2011
Last updated: 04/14/11 at 01:09 PM
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This was billion years ago when oxygen first came to the Earth.
The earth's oldest rock .
The world's oldest fossilwww.wikipedia.com
early time organisms