Atmospheric oxygen may account for popularity of placentas.
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References
FalkowskiP.G., et al. Science, 309. 2202 - 2204 (2005).
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University of Washington, Seattle
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Ball, P. Continental split boosted big mammals. Nature (2005). https://doi.org/10.1038/news050926-13
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DOI: https://doi.org/10.1038/news050926-13