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Bacteria and other prokaryotes are found deep underground, in water, and in the air. One micron...

Bacteria and other prokaryotes are found deep underground, in water, and in the air. One micron (10-6 m) is a typical length scale associated with these microbes.

(a) Estimate the total number of bacteria and other prokaryotes in the biosphere of the Earth. (Assume the bacteria are found to a depth d = 1000 m below Earth's surface, and that there are an average of 100 bacteria in every 1 mm3 of volume.)

(b) Estimate the total mass of all such microbes. (Assuming a bacterium is basically composed of water.)

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