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In 2014,approximately what was the size of the U.S.economy?
White Blood Cells
Cells in the blood that are involved in protecting the body against both infectious disease and foreign invaders.
Immune System
The body's defense mechanism against infections, diseases, and other foreign bodies.
Antigens
Substances that the body recognizes as foreign and that elicit an immune response.
Resistance Phase
The second stage of the general adaptation syndrome, where the body adapts to and resists stress, mobilizing resources to cope with a stressor.
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