Horse/cow/deer all eat grass yet deers excretes pellets cows have patties and horse produce dried grass...why?

It's called FERMENTATION. In the rumen, anaerobic bacteria and microorganisms live in the rumen creating an anearobic environment where feed, like grass, is fermented to allow the break down of these linkages. The fermentation process allows for better nutrient absorption and digestion in the other two chambers of the cow (not including the reticulum, which is just a chamber that stores foreign particles that could damage the animal's GI tract.) Water is squeezed or absorbed in the omasum, and protein digestion occurs in the abomasum.

Protien digestion wouldn't happen as completely as it would if it weren't for the fermentation process that happens in the rumen.

Like every other herbivore! Why herbivores EAT more & more often,dear.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.