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A structural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of: A) smooth muscle B) skeletal muscle C) respiratory cilia D) rings of cartilage
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A structural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of:

A) smooth muscle
B) skeletal muscle
C) respiratory cilia
D) rings of cartilage

User Peter Sladek
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1 Answer

2 votes
The answer is D(rings of cartilage)
User Shumii
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