Question

the skin and mucous membranes are examples of:
a chemical barriers
b mechanical barriers
c phagocytic defenses
d inflammatory defenses

Explanation:

The skin and mucous membranes physically block pathogens from entering the body, which classifies them as mechanical barriers. Chemical barriers involve substances like enzymes and antibodies, phagocytic defenses are related to cells that engulf pathogens, and inflammatory defenses are a response to tissue damage or infection.

Answer:

B. Mechanical barriers