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6 (a)1 Large surface area provided by lamellae/filaments;2 Increases diffusion/makes diffusion efficient;3 Thin epithelium/distance between water and blood;4 Water and blood flow in opposite directions/countercurrent;5 (Point 4) maintains concentration gradient (along gill)/equilibrium not reached;6 As water always next to blood with lower concentration of oxygen;7 Circulation replaces blood saturated with oxygen;8 Ventilation replaces water (as oxygen removed);
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