First to figure out what the internal systems of a cow is like gets brainliest. I don't even know, but the most sciency answer wins.

The cow's digestive tract consists of the mouth, esophagus, a complex four-compartment stomach, small intestine and large intestine (figure 1). The stomach includes the rumen or paunch, reticulum or "honeycomb," the omasum or "manyplies," and the abomasum or "true stomach."

Explanation:

The four compartments allow ruminant animals to digest grass or vegetation without completely chewing it first. Instead, they only partially chew the vegetation, then microorganisms in the rumen section of the stomach break down the rest. Animals with singular stomach compartments — known as a monogastric digestive system — do not have the same capability.

Explanation:

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in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".