At some time in life's history, microorganisms started to make metabolically usable nitrogen from N2 in the atmosphere. A provocative proposal accounts for the 'why and when' of that event.
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Kasting, J., Siefert, J. The nitrogen fix. Nature 412, 26–27 (2001). https://doi.org/10.1038/35083660
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DOI: https://doi.org/10.1038/35083660
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