Cows are able to survive on a diet consisting almost entirely of cellulose because
A. cows are autotrophic.
B. cows can manufacture all 20 amino acids out of sugars in the liver.
C. unlike humans, the saliva the cow produces has enzymes capable of digesting cellulose.
D. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
D. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
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