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Human beings normally have many bacteria living in their intestines. The bacteria get what they need from the human digestive tract. In return, they make vitamins that the human body needs. This relationship between human beings and bacteria is an example of

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Human beings normally have many bacteria living in their intestines. The bacteria get what they need from the human digestive tract. In return, they make vitamins that the human body needs. This relationship between human beings and bacteria is an example of






 
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