types of surface exchanges 2.0 / 5 based on 1 rating ? BiologyExchange of materialsGCSEAQA Created by: KIM JONG UMCreated on: 05-04-13 14:59 where are the villi? they line the inside of the small intestine 1 of 5 what are villi? they are the exchange surface for the small intestine 2 of 5 give two features of the villi that make it an efficiant exchange surface they have thin walls/big surface area 3 of 5 name 2 exchange surfaces and where they are alveoli(lungs) / villi(small intestine) 4 of 5 finsihed finished 5 of 5
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