<span>Basically, the body needs to know what it is defending against. Your body can still (usually) fight off infection, even without an immunization, but it takes longer. Basically, your body creates cells with a receptor for a specific disease. When this cell finds the disease it is programmed for, it will send out signals to the "killer" cells to come and kill it. If your body doesn't have the "seeker" cells, it can't fight off the infection until it does. The opposite end are autoimmune diseases, where your immune system starts attacking itself.
brainlest answer</span>
Answer:
Hola! :) El nombre cientifico del estudio cientifico de las poblaciones humanas es llamado demografia
Explanation:
Espero que esto ayude :)
<span>D) reduce the amount of electricity he uses.( good luck m8 tell me if I'm wrong</span>
