Question

38. From where does dust enter into the air? What will happen if we breathe through our mouth ? Explain.​

Answer 1

A mucous membrane lines your nasal cavity and it helps keep your nose moist. Little hairs inside your nasal cavity help filter the air you breathe in, and block dirt and dust from getting into your lungs. When you breathe in through your mouth, or oral cavity, the air is moistened, but not filtered.

Answer 2

Answer:

From where does dust ente ito the air