Question

an individual was exposed to a contagious disease but did not become infected. the agent was unable to enter the body and grow because it was stopped by the persons skin. this is an example of how a ______ can prevent disease.
a. chemical barrier
b. physical barrier
c. protective behavior
d. medication
please select the best answer from the choices provided

Explanation:

The skin acts as a physical barrier. A chemical barrier would involve substances like enzymes or acids. Protective behavior would be actions like wearing masks. Medication is a substance taken to treat or prevent disease. Since the agent was stopped by the physical structure of the skin, it is a physical barrier.

Answer:

B. physical barrier