How are respiratory surfaces in animals adapted/ suited to their function?

Answer:

-They are many/numerous/highly branched/dissected; to provide a large surface area across which large amount of gases diffuse;
-They are moist; to dissolve gases/allow them diffuse in solution form;
-They are made of thin membrane/epithelium/one cell thick wall; to reduce diffusion distance for faster diffusion of gases;
-They are highly vascularized/have dense network/many capillaries; to carry away oxygen; and bring carbon (IV) oxide; / create a steep concentration/ diffusion gradient, for efficient diffusion of gases;

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