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The diagram represents a section through the small intestine.

What is the role of the structure labelled X? A. They help to move the food along 

B. They make a large surface area for absorption 

C. They protect against bacteria 

D. They move mucus over the surface

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The presence of villi and microvillus in the inner lining of small intestine increases the surface area for absorption. They allow more area for the enzymes to work efficiently.

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