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This is a mathematical problem rather than microbiology, but its aim is to understand that a very small thing and another, very numerous.
Assuming that there are 10 27 cells Pelagibacter locate in all seas and assuming that the average size of a cell is 1 micron cube and its density is the same as the water to make simple calculations.
How heavy is the planetary biomass Pelagibacter locate? Compare it
then with human total biomass (pulling from the top, 6,500 million people with an average weight of 60 kilos per person).
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