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Which tool allows you to cross-tabulate more than one variable?
Leukocytes
White blood cells that are part of the immune system, involved in protecting the body against both infectious disease and foreign invaders.
Memory Lymphocytes
Specialized white blood cells that remember previous invaders and help the immune system respond more quickly and effectively to diseases the body has encountered before.
Immune System
The body's defense system against infections, diseases, and other potentially damaging foreign bodies.
Antigens
Substances that induce an immune response in the body, especially the production of antibodies.
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