This system is our body's defense against infections and diseases.

How does secondary succession differ from primary succession?

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen

24. how are vaccines used to keep people healthy?