Question

please explain this answer.

Answer 1

》 Grass eating animals like cow, goat, bison etc. are unable to digest the plant material directly because they do not have the enzymes to break down cellulose in the cell walls. These animals have four chambered stomach and the process of digestion is as follows: ... The partially digested food is called cud.

Answer 2

you saw a buffalo when he chew or rotate his mouth like he is eating something but he is eat his food earlier. and now it is just digest his food completely by chewing it.
this is the meaning of your question.

hope it's helpful