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The function of villi, small finger-like projections in the intestines, is to allow for more surface area in the small intestines. This way, absorbing nutrients from digested food into the blood would improve greatly. Although they do not help in digestion, they are still important parts of the digestive system.  

Jennnyyy
well the main purpose of the Villi (small intestine's surface) is to help increase the surface area for the intestine. Because the bigger the surface area the more it has for absorbent. And this plays a huge part because  the food that we eat has vitamins and nutrients that your body needs to function properly. 
hope this was helpful:)

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