princessp1998 princessp1998

29-08-2017
Health

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A structural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of:
A) capillaries
B) villi
C) veins
D) arteries

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jadeenglehart9oveysh jadeenglehart9oveysh

29-08-2017

answer would be b) villi

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