What benefit is gained by intestinal bacteria living in a mutualistic relationship with an animal?

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Intestinal bacteria in a mutualistic relationship with an animal gain a regular source of nutrients. The bacteria break down food particles that are indigestible by the animal's digestive enzymes, releasing nutrients that the animal can absorb and use. In turn, the bacteria are provided with a stable environment and a constant supply of nutrients. Mutualism benefits both the animal and the bacteria.

What Benefit Is Gained by Intestinal Bacteria Living in a Mutualistic