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An Overview of the Body's Defenses. The first line of defense, the skin and mucous membranes, prevents most microbes from entering the body. - ppt download
Immune System and Other Body Defenses: Overview, The first line of defense: physical barriers, The second line of defense: the immune system, Other defenses, Immune responses and disease
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Biological defense mechanisms that protect the body. The immune system... | Download Scientific Diagram
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