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Keywords: animals
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Journal:
Emerging Topics in Life Sciences
Emerg Top Life Sci (2018) 2 (2): 161–171.
Published: 29 June 2018
... history. Geochemical data indicate that the Tonian Period may have witnessed a significant increase in atmospheric pO 2 levels and a major transition from predominantly sulfidic to ferruginous mid-depth seawaters. Molecular clock estimates suggest that early animals may have diverged in the Tonian Period...
