Question

What is the role of the cilia that line the respiratory tract?

A: They exchange gases with capillaries.

B: They prevent food or liquid from entering the trachea.

C: They capture mucus that contains dust and microorganisms.

D: They warm and moisten the air.

Answer 1

hey dear your answer is option C .i.e.
cilia work together with goblet cells . they capture mucus that contains what and microorganism ..
hope it helps dear..