Avertebrate has scaly skin, internal fertilization, and amnionic eggs. which class does this vertebrate belong to? . a. amphibian. b. reptilians

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