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Why do the walls of the trachea not coll...

Why do the walls of the trachea not collapse when there is less air in it ?

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CPC CAMBRIDGE PUBLICATION-PRACTICE QUESTION PAPER -12-ANSWER THE FOLLOWING QUESTION
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  2. Why do the walls of the trachea not collapse when there is less air in...

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  9. What is resistance of a conductor ? Mention the factors on whic...

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