what do saliva, tears, and nasal mucus have in common? all can be classified as biological barriers. all…

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

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

Answer

Brief Explanations:

Saliva, tears, and nasal mucus are first - line defenses. They are biological barriers that prevent pathogens from entering the body. Langerhans cells are in the skin. Lysozyme in them can damage bacterial cell walls but not all of them can always do so. They are not part of the complement system.

Answer:

A. All can be classified as biological barriers.