Which of the following structures are tubes?

A. Frontal, maxillary, sphenoidal, ethmoidal
B. Eustachian, pharynx, bronchi
C. Cilia, adenoids, mucous, epiglottis
D. Apex, base, hilum

2 answers

And your choice is? You could look each word up in a dictionary to help decide.

Sra
which of the following strutures are tubes?
A. eustachain, pharynx, bronchi
B. Frontal, Malillary, Sphenoidal, Ethmoidal
C. Apex,base, Hilum
D. Cilia, adenoids, mucous, epiglottis
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