Why is the skin known to be the body's most important nonspecific defense ?

Explanation:

The body's most important nonspecific defense is the skin, because it acts as a physical barrier to keep pathogens out. Even openings in the skin (such as the mouth and eyes) are protected by saliva, mucus, and tears, which contain an enzyme that breaks down bacterial cell walls.

thinking it would be d not too sure but i think it's right

not sure if this is what you'r looking for eubacteria and archaebacteria