If you are exposed to a pathogen, get sick and recover, you have created
that will help prevent you from getting sick from the same
pathogen in the future. *

memory cells

Explanation:

Your body recognizes the bacteria as an invader because of the proteins shape on the surface of it. The shapes are different than those of the ones in the human body.

- White blood cells work together to fight the invaders. One type of the white blood cells make antibodies to fight the invaders. They stick to the bacteria's surface which kills the bacteria or disables them.

-Eventually your body will get rid of all the bacteria and you'll recover. Some white blood cells then become memory cells.

Memory cells will help you fight off the bacteria if they invade the body again. The immune system will respond so quickly that you won't get sick.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs