Concept:The villus is an adaptation of the small intestine for absorption.
Explanation:The villi are tiny finger-like projections lining the small intestine.
They greatly increase the internal surface area of the intestinal wall.
A larger surface area allows digested food molecules to be absorbed more quickly and efficiently.
The thin, one-cell-thick wall of each villus also shortens the diffusion path for absorbed nutrients.
This makes the villus significant for absorption, not for digestion, mixing, or filtering.
Answer:A. Increases the surface area for absorption