Answer the following question given this paragraph: 

Air enters the respiratory system through the nose. As the air passes through the nasal cavity, mucus and hairs trap any particles in the air. The air is also warmed and moistened so it won’t harm delicate tissues of the lungs.


Q: In the nasal cavity, what 2 things trap particles from incoming air?

 Choices:

- phlegm and hair

- saliva and hair

- mucus and skin

- mucus and hair

A:
mucus and hair
