Which of the following digestive system structures is greatly expanded in size in koalas,resulting in a very large surface area for prokaryotes to digest plant material?

Question

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The cecum is greatly expanded in size in koalas, which allows for a large surface area for prokaryotes to digest plant material. This is necessary because koalas feed on eucalyptus leaves, which are tough and contain compounds that are difficult to digest. The prokaryotes in the cecum break down these compounds and allow the koala to extract nutrients from the leaves. The other structures listed do not play as significant a role in digestion of tough plant material.

Which of the Following Digestive System Structures Is Greatly Expanded