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Millions of years ago your ancestors made a fragile deal with a team of microbial species—humans provide them with a long, warm tunnel to live in and a constant stream of stuff they can eat, and in turn they break down carbohydrates that we can’t digest and produce certain vitamins that we can’t make ourselves. The bacteria of the microbiome are tenants of sorts and these resources are the rent they have to pay. These bacteria are called commensal bacteria,
