I think it’s C hope it helps
Your mouth, nose, throat, sinuses and lungs are lined with mucus membranes. These membranes contain mucus glands that produce - surprise - mucus. Mucus-producing membranes line specific passages in your body, like the respiratory and digestive tracts, for protection and support.
Answer: A
Explanation: C would be the Fallopian tubes
Bacteria,viruses,fungi,and protozoa
Bacteria can be helpful