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Observe the diagram. Identify 1,2,3 and 4. Select the option with the correct identification and its main function.

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Trachea long tube supported by chitinous rings for conducting air

Pleural membrane surround ribs on both sides

Bronchus for exchanging of gases

Diaphragm helps in creating pressure gradients

answer is D.

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Detailed Solution

Diaphragm helps in creating the pressure gradient required for the process of respiration. Alveoli help in gas exchange. Trachea is supported by cartilaginous rings. Lungs are surrounded by pleura.

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