1. It is known that no person lives very long without an immune system. 2. pathogenic parasites do not attack the human body. 3. The special defense is activated when the invaders reach it. 4. Scientists claim that the nonspecific defenses of the skin do not recognize the antigen. 5. toxic means very pleasant or acceptable. 6. Most of the cells in the body's tissues are destroyed by parasites. 7. nonspecific defenses are the body's first line of defense against
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