Final answer:
The ratio of bacteria to human cells in our body can be 10:1 according to one study, but more recent studies suggest it could be closer to 1:1. Bacteria thrive in various parts of the body including the mouth, nasal cavity, throat, ears, gastrointestinal tract, vagina, and on the skin.
Step-by-step explanation:
According to a report by National Institutes of Health, prokaryotes, especially bacteria, outnumber human cells 10:1. More recent studies suggest the ratio could be closer to 1:1, but even that ratio means that there are a great number of bacteria within the human body. Bacteria thrive in various parts of the body including the mouth, nasal cavity, throat, ears, gastrointestinal tract, and vagina. Large colonies of bacteria can also be found on healthy human skin.
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