Question

1. name the cells that protect us from re - infection by pathogens that we were previously exposed to.

a b cells
b t cells
c memory cells
d macrophages

Explanation:

Memory cells are part of the immune system. They "remember" pathogens from previous exposures. When the same pathogen enters the body again, memory cells quickly respond, preventing re - infection. B cells produce antibodies. T cells are involved in cell - mediated immunity. Macrophages are phagocytic cells that engulf pathogens. But it is memory cells that specifically protect against re - infection by previously encountered pathogens.

Answer:

C. Memory cells