Answer:
The missing options are:
a.lining the pharynx
b.lining the trachea
c.within the walls of the alveoli
d.You would find epithelial cells in all of the listed answer choices.
The correct answer is d. You would find epithelial cells in all of the listed answer choices.
Explanation:
Epithelial cells are in all the options mentioned above because they are the ones that form the tissue of the respiratory system, and that form a barrier between the exterior and the interior of the body as a mechanism of protection. They also are in the skin or the urinary system.
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