list significant features of respiratory surface?
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1. The surface is fine and delicate.
2. It is designed to increase the surface area of absorption.
3. There is a mechanism to move air in and out.
4. It is protected inside the body of the organism.
2. It is designed to increase the surface area of absorption.
3. There is a mechanism to move air in and out.
4. It is protected inside the body of the organism.
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