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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Koalas have a greatly expanded cecum, which allows for a large surface area for prokaryotes to digest tough plant material, such as eucalyptus leaves. This adaptation is necessary because koalas are herbivores that have evolved to specialize in a diet of high-fiber, low-nutrient eucalyptus leaves. The cecum acts as a fermentation chamber where symbiotic bacteria break down cellulose and other complex carbohydrates into simpler compounds that can be absorbed and used by the koala's body.

Which of the Following Digestive System Structures Is Greatly Expanded