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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.
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Answer 1

Saliva, tears, and nasal mucus are biological barriers that help protect the body against pathogens.

Step-by-step explanation:

Saliva, tears, and nasal mucus have in common that they all can be classified as biological barriers. These body fluids serve as a first line of defense against pathogens and provide a physical barrier to prevent entry into the body.

Learn more about Biological barriers in the human body