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What is the order of magnitude of the number of microorganisms in the human intestinal tract? A typi- cal bacterial length scale is 10-6

What is the order of magnitude of the number of microorganisms in the human intestinal tract? A typi- cal bacterial length scale is 10-6 m. Estimate the intes- tinal volume and assume 1% of it is occupied by bacte- ria. (b) Does the number of bacteria suggest whether the bacteria are beneficial, dangerous, or neutral for the human body? What functions could they serve?

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