Anonymous Answered question December 24, 2021
I think about 8.7 million (give or take 1.3 million) is the new, estimated total number of species on Earth — the most precise calculation ever offered — with 6.5 million species on land and 2.2 million in oceans. Announced by the Census of Marine Life, the figure is based on a new analytical technique. The number of species on Earth had been estimated previously at 3 million to 100 million.
Source:
https://www.sciencedaily.com/releases/2011/08/110823180459.htm
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