How Are Cows Able to Eat Grass?

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The answer to this lies in microorganisms - organisms that are so small that they are invisible to the naked eye. These exist in two forms - ones that are beneficial to us, like those that form curd or ferment food, and ones that are harmful to us, like those that rot things. The stomach of the cow is lined with beneficial microorganisms. When a cow eats grass, these microorganisms break the complex cellulose present in grass into simpler substances, which are easy to absorb and digest.