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15. Mouth, teeth, pharynx. Fig. 16.1 Liem, Bemis, Walker & Grande. In Deuterostomes, mouth forms where the archenteron meets the stomodeum (a fold in
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Exchange Systems F211. Explain, in terms of surface-area-to-volume ratio, why multicellular organisms need specialised exchange surfaces and single-celled
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4.3 Exchange of gases in the lungs. Learning Objectives What are the essential features of exchange surfaces? How are gases exchanged in the alveoli of
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