. They have a large surface area in order to increase the rate of diffusion
2. They are usually thin and permeable in order to reduce the resistance to diffusion
3. They are moist to dissolve the gases
4. They are well supplied with blood.
Types of respiratory surfaces in animals
Small animals such as amoeba use their entire body surface for gaseous exchange. They have a high surface area /volume ratio. As organisms increase in size, the surface area/volume ratio decreases, hence there is need to have special respiratory system or organs
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