Active immunity results when an immune response to a pathogen produces memory cells.
Pathogens are germs that cause disease.
Active immunity results when an immune response to a germ produces memory cells.
Active immunity is when an immune response occurs after a germ produces what?
1) harmful substances
2) bioaerosols
3) rapid expansion
4) Allergies
5) anemia
6) it needs them
7) Chemical energy
8) memory cells