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The top documents tagged [presentpaleozoic era]
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Image used by permission from nasa.gov; rst.gsfc.nasa.gov/Sect19/Sect19_2a.htmlrst.gsfc.nasa.gov/Sect19/Sect19_2a.html Geologic Time Scale Hadean Eon:
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The History of Life on Earth
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Bellringer Friday, 02/23
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