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The surface across which breathing in animals occurs is very fine and delicate. How do the organisms protect their body by such surfaces?

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In almost all the organisms the breathing surface is very fine and delicate for easy and fast exchange of gases. Since they are very delicate they must be protected from external environmental conditions. So for protection these structures are covered well in a layer of tissues. Like in human beings the exchange of gases take place through alveoli which are present in the lungs which are further protected from environment by ribs and diaphragm.

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