How much does the bacterial species outnumber the mammalian species by?
factor of 10,000
Bacterial species significantly outnumber mammalian species. According to current estimates, there are approximately 5 to 10 million different bacterial species on earth, while there are around 5,500 mammalian species. This means that the number of bacterial species outnumbers mammalian species by a factor of at least 1,000. It is important to note that these estimates are constantly changing as new species are discovered and classified through ongoing research.
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