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the figure shows a diagrammatic view of human respiratory system with labels A, B , C and D . Select the option which given correct identification and main function and / or characteristic

A

(i) Trachea: It is supported by bony rings for conducting inspired air

B

(ii) Ribs: When we breathe out, ribs are lifted

C

(iii) Alveoli: Thin-walled sac like structures for exchange of gases.

D

(iv) Diaphragm: It is pulled up when we breathe in.

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