Why trachea not collapse when__there is no air in it?

1.	Why trachea not collapse when__there is no air in it?
Answer» Due to rings of cartilage Because it has 16_20 incomplete C like structure ring of cartilage. Rings of cartilage Due to present of rib cage Due to the ring of cartilage It is made up us cellulose Because it is surrounded by rings of cartilage

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