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    The human body is home to trillions of bacteria, which collectively make up what is known as the human microbiota. Estimates suggest that there are roughly around 30 to 40 trillion bacterial cells inhabiting the human body. These bacteria reside in various parts of the body, including the skin, mouth, gut, and reproductive organs, among others. Despite their large numbers, many of these bacteria are harmless or even beneficial, contributing to essential functions such as digestion, immune system regulation, and protection against harmful pathogens.

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