Biology 11: Immune System and Disease Worksheets

c. by the respiratory tract, but not by the intestinal tract. b. by healthy tissues, including the respiratory tract and intestinal tract. a. only damaged respiratory passages. 4. The diagram below shows the process of . d. phagocytosis. c. pinocytosis. b. cilia action. a. skin cell production. 5. When bacteria enter the body through a cut in ... ................
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