What is villi
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Villus, plural villi, in anatomy any of the small, slender, vascular projections that increase the surface area of a membrane. ... The villi of the small intestine project into the intestinal cavity, greatly increasing the surface area for food absorption and adding digestive secretions.

Explanation:

Villi are small finger lile projections found in the small intestine. They mainly help to increase the surface area of absorption. They are also supplied with numerous blood vessels.

Explanation:

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3.a

4.d

5.b

6.b

7.c

8.a

9.d

10.a

c is the correct answer for this question.