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It has to do with nutrients. Since humans can't digest grass, they used cows as a proxy to get the nutrients. The cow can break down the cellulose into nutrients, and pass it on to the milk.
Why do we drink milk?
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It has to do with nutrients. Since humans can't digest grass, they used cows as a proxy to get the nutrients. The cow can break down the cellulose into nutrients, and pass it on to the milk.