Most precise estimate yet suggests more than 80% of species still undiscovered.
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References
Mora, C., Tittensor, D. P., Adl, S., Simpson, A. G. B. & Worm, B. PLoS Biol. 9, e1001127 (2011).
May, R. M. PLoS Biol. 9, e1001130 (2011).
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Sweetlove, L. Number of species on Earth tagged at 8.7 million. Nature (2011). https://doi.org/10.1038/news.2011.498
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DOI: https://doi.org/10.1038/news.2011.498
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