Bacteria in our large intestine break down foodstuffs that would otherwise be expelled as feces. As they break down the food, vitamins are released and absorbed. This is an example of:

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Mutualism is a type of symbiotic relationship where both parties benefit from the interaction. In this example, the bacteria and the human host benefit from each other: the bacteria break down foodstuffs that would otherwise be expelled as feces, and in doing so, release vitamins that are absorbed by the host. In return, the bacteria have a safe environment to live in and a steady supply of nutrients. Therefore, this is an example of mutualism.

Bacteria in Our Large Intestine Break Down Foodstuffs That Would