Miguel is evaluating two claims that he read about animal systems. Both claims are made by reliable sources.

Claim 1: No animal can make the enzymes that are necessary for the digestion of cellulose.

Claim 2: Cattle, goats, sheep, and other ruminants are able to digest grasses, which are mostly cellulose.

Which additional statement is most useful for evaluating the two claims?

A. Ruminants digest cellulose without the use of enzymes.
B. Ruminants have flat teeth that are ideal for grinding plant matter.
C. Symbiotic microorganisms in the ruminants make the enzymes for digesting cellulose.
D. Symbiotic microorganisms in the ruminants remove cellulose from grasses without digesting it.