Question

how is the 3rd line of defense (adaptive immunity) different than the first two? its specifically targeted to a particular antigen on a particular pathogen, while the first two lines of defense were non - specific and would attack any invader. it will attack all cells that enter the body, whether they are harmful or not, and cause a large - scale immune response. it is often involved in the curing of allergic reactions to viruses and bacteria that enter the body. rewatch submit

Explanation:

The third line of defense (adaptive immunity) is antigen-specific, targeting particular pathogens, while the first two lines (innate immunity) are non-specific. The first option correctly states this key difference. The second option is incorrect because adaptive immunity does not attack all cells. The third option is incorrect as allergies are not cured by adaptive immunity against pathogens.

Answer:

A. It's specifically targeted to a particular antigen on a particular pathogen, while the first two lines of defense were non-specific and would attack any invader.