Grazing, or just plain eating if they're at a feed bunk or bale of hay. However, some, if not most, state that the answer to this question is rumination, even though, technically speaking, "rumination" is not exactly the whole "process of cows eating."
Energy...
Eating grass
Cows make milk from eating grass.
Cows don't any crops on farmville.
Plant-eating animals are generally considered herbivores.
Do you have thoughts? Yes. Then cows do.
grazzing
By eating your sandwich
The oxpecker, but it often actually sucks blood out of wounds on the cows as well as eating parasites.
Contaminated by what?
the cows name is kelly
humans are animals and they benefit from eating cows. humans also benefit from drinking the milk of cows.