I'm pretty sure they usually have more than 1 stomach (ex: cows have 4), and their teeth are made for grinding up plants.Cellulose is broken down in two ways, mostly:
Mechanically, animals will keep grinding it with their teeth or in their stomachs with small swallowed stones until it's broken down and the cell contents spill out. Cows for instance will keep regurtitating their food so that they can chew it for a long time.
With enzymes, more specifically cellulase, which mammals don't produce. Grazers live with bacteria in their gut which do, and these break down the molecular structure of cellulose.
cud chewing
Plants
None of them...they all are examples of adaptation.
Blood transports oxygen nutrients and wastes in mammals and fish .
P. P. Gambaryan has written: 'How Mammals Run' -- subject(s): Anatomy, Animal locomotion, Biological Adaptation, Locomotion, Mammals, Adaptation (Biology)
rumen
Upright gait. Firstmate
Becoming cold-blooded
Yes, mammals have villi. An example is the villi in the intestines of humans which help to absorb nutrients.
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No mammals eat logs. However, beavers and porcupines chew on logs to eat the bark and soft fibers between the bark and the wood. Mammals cannot break down the cellulose of wood.
It is a good source of nutrients to newborns.