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Microorganisms break down our food for us. In our stomach, yes acid does it's part, but acid can only eat the outside in and also can not travel through the rest of the digestive track without being dissolved or harmful to the rest of the body. Bacteria continue the breaking down process without hurting our body (not all bacteria do this, in specific only the ones who specialize in doing so.). That's why cows would die without bacteria. Their systems especially depend on bacteria, although they still have to chew a lot.

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