the small intestine actually does a lot of the digesting. Inside of the small intestine are small, finger-like villi that absorbs nutrients. Without it, your digestive system can not function correctly.
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Absorption takes place in small intestine which means all the nutrients from the chym (food in digestive path).
On the inner wall of small intestine numerous finger like projections are found which are called as villi, they increase the surface area of absorption.

So, we can say that the small intestine also plays a very important role as all the other digestive organs in digestion.
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