Answer:
the immune system needs B cells and memory B cells form into memory cells so that remember the same pathogen and the antibody used to take it down for faster antibody production in future infections when most of the same antigens infect the body again.
Step-by-step explanation:
When the body senses foreign substances like antigens, the immune system works to recognize the antigens and get rid of them. B Cells that have a certain antibody codes/proteins for the specific antigen are triggered or activated by T cells to make the specific antibodies, or immunoglobulins, to use against the antigens, by locking onto the antigen and putting the antibodies into the antigen directly.