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it has villi in its wall where it absorbs nutrient.......................................some digestive juices make it into usable form
Good answer, there are also bacteria in the digestive system that are thought to aid in fermenting some otherwise unusable material.
Nutrients are absorbed through the thin layers of ciliated tissues lining the wall of the small intestine after being broken down into monomers by gastric juices, which are small enough for the lining cells to pass them through via active transport. The nutrients then enter the bloodstream via the small intestine-capillaries.
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The small intestine also has villi, which are small projections like little fingers. Each villus is also covered with microvilli, which are microscopic bumps on each villus. So the intestine's surface area is greatly greatly increased, and that allows it to more effectively absorb nutrients through the cells on the inside surface of the intestine, which can then be passed to the bloodstream and circulated around the body to where they are needed.