Question

select the correct answer. larry is taking a walk in the park. the pollen in the air makes him sneeze constantly. what line of defense is his immune system exhibiting? a. first line of defense b. second line of defense c. third line of defense d. fourth line of defense

Explanation:

The immune system's first - line of defense includes physical and chemical barriers like the skin and mucous membranes. When pollen in the air causes sneezing, the body is using the mucous membranes in the nasal passages (a first - line defense mechanism) to try to expel the allergen.

Answer:

A. first line of defense