a)to move air toward the lungs while warming, moistening, and filtering it
Explanation:
The respiratory system consists of the upper and lower respiratory tract (airways). The upper respiratory tract consists of organs located outside the rib cage: external nose, nasal cavity, pharynx, larynx and upper trachea. These organs are responsible for the entry of oxygen into the body, so we can say that the function of the upper respiratory system is to move the air in the environment towards the lungs while heating, moistening and filtering.
