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The immune system is the body's defense against infectious organisms and other invaders. Your immune system works by recognizing the difference between your body's cells and alien cells, allowing it to destroy anything that could be potentially harmful. Active and passive immunity play an important role in keeping you healthy.

What is the difference between passive and active immunity? (SC.912. L.14.52)

A. Naturally acquired active immunity occurs when the person is exposed to a live pathogen, develops the disease, and becomes immune while naturally acquired passive immunity occurs during pregnancy, in which certain antibodies are passed from the maternal into the fetal bloodstream

B. Both passive and active immunity are interchangeable

C. Passive and active immunity are both 1st line of defenses

D. Passive immunity occurs when a person is exposed to a virus and active immunity occurs when the immunity is passed on through breast feeding