Villi are tiny finger-like projections present in the inner wall of the small intestine. They help in the movement of partially digested food through the small intestine and the removal of solid wastes from the body. What other function do villi have? A) They increase the surface area available for the absorption of nutrients. B) They prevent the partially digested food from returning to the stomach. C) They break down the protein present in food to produce urea. D) They help in removing excess urea and salt from the body.