The roof of the nasal cavity is formed by which bone?

What is called the bronchial tree?

The sound-producing organ in the human respiratory system is . . . . . . .

Where does oxygen finally reach from the lungs?

Choose the correct sentences for the conducting part of the respiratory system.
$(I)$ Transports the atmospheric air to the alveoli.
$(II)$ Clears it from foreign particles.
$(III)$ Humidifies the air.
$(IV)$ Brings the air to body temperature.

Alveolus of lungs is lined by . . . . . . .