What is the difference between the digestive system of a ruminant and a nonruminant animal?

Ruminant animals differ from nonruminants in several ways:
(a) The ruminant stomach consists of four compartments.
(b) Food material in the ruminant system is acted on by millions of bacteria and microorganisms.
(c) These bacteria and microorganisms transform low-quality protein and some nitrogen compounds into
essential amino acids.
(d) The bacteria and microorganisms also aid in the manufacture of needed vitamins, including the
B-complex group.
(e) Food material not fully digested in the rumen can be regurgitated in the form of cud. The animal chews
on this cud and then swallows it back down into the rumen for further digestion.
(f) The ruminant digestive system can utilize large amounts of roughage.