The type of immunity in which the immune system produces antibodies in response to the presence of a pathogen. It can last a few years or up to a lifetime. (Passive immunity / Active immunity / Artificial immunity)

It is a rounded mass of tissue that filters fluids from other body tissues and traps pathogens. (Red cells / Lungs / Lymph node)

A type of immunity acquired when a person receives antibodies from an outside source. It only lasts for a few months. (Passive immunity / Active immunity / Artificial immunity)

The body's ability to protect itself from pathogens before they cause disease. (Vaccine / Immunity / Breathing)