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(i) How does the air necessary for breathing enter the body of a human being? 

(ii) What other function is performed by this part of our respiratory system?

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(i) Oxygen enters the body in the mouth and nose, passes through the larynx and the trachea. 

As shown in the diagram given below:

(ii) Nose - The nose is the primary organ of smell and also functions as part of the body's respiratory system. 

Mouth – Mostly the breathing is done through nose i.e. nasal cavity. But, it can be done through oral cavity as well.

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