Question

The surface layer of cells of the villi is very thin. What is the advantages of this?

Answer 1

Villi are specialised for absorbtion and have single cell thick walls. These thin walls enable a shorter diffusion path.

Explanation:

The villi and micro villi increase intestinal absorptive surface providing exceptionally efficient absorbtion of nutrients in the lumen.
They also have a rich blood supply to maintain a concentration gradient.