Number of prokaryotes in the ocean beneath 200m world wide

Value 6.5E+28 cells
Organism Biosphere
Reference William B. Whitman, David C. Coleman, and William J. Wiebe. Prokaryotes: The unseen majority. Proc Natl Acad Sci U S A. 1998 June 9 95(12): 6578–6583.PubMed ID9618454
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ID 100551