Microscopes use two systems: The mechanical system and the optical system. Which of the following are not part of the optical system? a. condenser

b. light source

c. revolving nose piece

d. objectives

e. ocular lens

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