We breathe in or out air with the help of windpipe called trachea. The – McqOptions

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1.	We breathe in or out air with the help of windpipe called trachea. The trachea does not collapse during the breathing process, because it is made up of ring of soft bones called:
A.	(a) Ribs
B.	(b) Cardiac muscles
C.	(c) Cartilage
D.	(d) Ligaments
E.	(e) None of these
Answer» D. (d) Ligaments

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