(A) The low pH of the environment.
(B) The physical barrier produced by hairs.
(C) Phagocytosis by macrophages.
(D) Mucus joint with movement of cilia of lining cells.
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(A) The low pH of the environment.
(B) The physical barrier produced by hairs.
(C) Phagocytosis by macrophages.
(D) Mucus joint with movement of cilia of lining cells.