Answer: Mucus traps pathogens and destroys them before they can enter the body.
Step-by-step explanation:
Mucus is a thick viscous liquid secreted by the mucous membranes typically present in the salivary and nasal glands. The mucous secreted by these glands capture the entering disease causing pathogens inside the body. The minute single celled pathogens get stick to the viscous mucous. The mucous destroys these pathogens and prevents the cause of disease.