How many species exist on Earth? Projections range from millions to trillions. A 2011 paper in PLOS Biology provided a comprehensive estimate of 9 million.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10659151 | PMC |
http://dx.doi.org/10.1371/journal.pbio.3002388 | DOI Listing |
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