Single-celled microbes fertilize the oceans.
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References
Zehr, J. P. et al. Unicellular cyanobacteria fix N2 in the subtropical North Pacific Ocean. Nature 412, 635 - 638 (2001).
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Unicellular cyanobacteria fix N2 in the subtropical North Pacific Ocean. Nature (2001). https://doi.org/10.1038/news010809-11
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DOI: https://doi.org/10.1038/news010809-11