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How many different types of bacteria are on earth?

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The species concept for prokaryotes (archaebacteria and eubacteria including cyanobacteria) is very different from higher organisms. A low estimate of species is in the range of a few thousand species. read more

This technique included the assumption that the populations of different species of bacteria were approximately similar, however, which is now known to be false. An updated survey by Jason Gans found there to be about a million bacterial species per 0.035 ounces (1 gram) of soil. read more

In 1998, William Whitman and his team at the University of Georgia estimated the number of bacteria living on the earth by examining different habitat types and estimating those numbers separately. read more

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