Answer: Three modification of the small intestines that increase the surface area for absorption are: VILLI, MICROVILLI AND MUCOSAL FOLDS.
Step-by-step explanation:
The small intestine is the longest part of the alimentary canal and its is the place, where the absorption of digested food usually take place. The modification of the small intestines that increase its surface are are villi, micro villi and mucosal folds. The inner surface of the small intestine is folded into many circular parts; this increases the surface area of the organ. The mucosal forms many projections, which give rise to the villi. The microvilli, which is the lumenar plasma membrane is also densely packed with mircrovilli. All these modification increases the surface area of the small intestines.