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:
OD
Explanation:
OD is the answer because her friend's supported her through the journey, which is her social environment so I hoped I helped:
