Final answer:
Red blood cells and platelets do NOT perform defensive functions in blood, while antibodies and white blood cells do.
Step-by-step explanation:
The components of blood that do NOT perform defensive functions are red blood cells and platelets. Red blood cells are responsible for carrying oxygen to the body's tissues and removing carbon dioxide, while platelets are involved in blood clotting. The defensive functions of blood are primarily carried out by antibodies and white blood cells. Antibodies are proteins that help identify and neutralize pathogens, while white blood cells are responsible for fighting infections and foreign substances.
Learn more about Components of blood performing defensive functions