Question

multiple choice question
which line of defense consists of several nonspecific defense mechanisms against pathogens that break through the skin or mucous membranes?

third
second
first

Explanation:

The body's first line of defense is the skin and mucous membranes (physical/chemical barriers). The second line includes nonspecific mechanisms (like inflammation, phagocytosis) that act when pathogens breach the first line. The third line is specific (immune response with antibodies/cells). So the line with nonspecific defenses against pathogens that broke through skin/mucous is the second.

Answer:

B. Second