why are the walls of the small intestine thin
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The inner wall of the small intestine has adaptation so that substances pass across it quickly and efficiently: it has a thin wall, just one cell thick. it has many tiny villi to give a really big surface area.
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Adaptations for absorption
The inner wall of the small intestine has adaptation so that substances pass across it quickly and efficiently: it has a thin wall, just one cell thick. it has many tiny villi to give a really big surface area
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