What do saliva, tears, and nasal mucus have in common? a .all can be classified as biological barriers. b .all contain langerhans cells. c .all can destroy bacterial cell walls. d. all are part of the complement system.

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What do saliva, tears, and nasal mucus have in common? a .all can be classified as biological barriers. b .all contain langerhans cells. c .all can destroy bacterial cell walls. d. all are part of the complement system.

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Everyone can destroy bacterial cell walls.