Did an increase in atmospheric oxygen concentration some time during the Neoproterozoic era, 1,000 to 543 million years ago, make possible the diversification of multicellular animals?
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Knoll, A. Breathing room for early animals. Nature 382, 111–112 (1996). https://doi.org/10.1038/382111a0
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DOI: https://doi.org/10.1038/382111a0