Cattle Are Able to Survive on a Diet Consisting Almost

Cattle are able to survive on a diet consisting almost entirely of plant material because cattle ________.

A) are autotrophic
B) re-ingest their feces
C) manufacture all fifteen amino acids out of sugars in the liver
D) saliva has enzymes capable of digesting cellulose
E) have cellulose-digesting, symbiotic microorganisms in chambers of their stomachs