Question

vaccination is a process of injecting a dead or weakened form of a pathogen into the body. how does this help strengthen the immune system?
it allows the body to increase its internal temperature.
it allows the body to regulate the inflammatory response.
it allows the body to keep pathogen information for future infections.
it allows the body to increase its desire to eat healthy food.

Explanation:

Vaccination involves introducing a dead or weakened pathogen. The immune system recognizes it as foreign. It then produces antibodies and memory cells. Memory cells "remember" the pathogen. So, in future infections, the immune system can respond quickly.

Answer:

It allows the body to keep pathogen information for future infections.