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Why does absorption of digested food occur mainly in the small intestine?

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Maximum absorption occurs in small intestine because
(a) digestion is completed 
insmall intestine
(b) inner lining of 
small intestine is provided with villi which increases the surface area for absorption.
(c) wall of 
 is richly supplied with blood vessels (which take the absorbed food to each and every cell of the body).

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