Mucous membrane and cilia lining the respiratory tract fight microorganisms by:

A. providing a barrier.
B. producing hydrochloric acid.
C. washing them away.
D. removing nutrients.
E. trapping them.

Ans: E. trapping them.
Explanation: The mucous membrane refers to a part that produces mucus and cilia lining refers to the hair like structure in the respiratory tract.They act as a protector by trapping the microorganism when they enter the respiratory system. In simple when a microorganisms pass through the respiratory system the hairline structure trap them and the mucus is secreted by the mucous membrane engulfs this microorganism and expels it through nose.
They fonts produce hydrochloric acid in respiratory tract or remove the nutrients

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