Question

one characteristic of the immune response is specificity. this means that
multiple choice
immunity is carried on by a specific group of cells of the immune system.
immunity is carried on by a specific group of tissues of the immune system.
immunity starts in specialized tissues in the body.
immunity is directed against a particular pathogen.
immunity starts in defined organs in the body.

Explanation:

The specificity of the immune response refers to its ability to target a particular pathogen. It is not about specific cell/tissue groups (as the immune system has multiple cell types working together), nor about where immunity starts (like specific tissues/organs). The key is the targeted action against a particular invader.

Answer:

immunity is directed against a particular pathogen.