15. Mouth, teeth, pharynx. Fig. 16.1 Liem, Bemis, Walker & Grande. In Deuterostomes, mouth forms where the archenteron meets the stomodeum (a fold in.
Exchange Systems F211. Explain, in terms of surface-area-to-volume ratio, why multicellular organisms need specialised exchange surfaces and single-celled.
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.
