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The top documents tagged [presence of free o2]
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presence of free o2
Photosynthesis and the Rise of Atmospheric Oxygen Assigned Reading Stanley: pp. 257-269, 323-325 Catling D. C., Zahnle K. J., and McKay C. P. (2001) Biogenic.
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Photosynthesis and the Rise of Atmospheric Oxygen
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The Archean: 4.6-2.5bya
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