Express the following as ratios

At the peak of the inspiratory phase, the alveoli in the lungs contain:

A) large quantities of carbon dioxide. B) minimal levels of oxygen and carbon dioxide. C) equal levels of oxygen and carbon dioxide. D) more oxygen than carbon dioxide.

When coding the phrase "acquired stenosis of right external ear canal secondary to trauma," the main term to reference in the index is _____.

A. acquired B. stenosis C. canal D. trauma