Which is a common passage for swallowing food and breathing?

Definition / Explanation: $(1)$ Alveoli

The function of surfactant is/are:

The epithelium of the alveoli in the lungs is .......... .

Identify which respiratory structure possesses the following features and choose the correct option accordingly.
$I.$ Found in mammals
$II.$ Highly muscular and fibrous partition,elevated towards the thorax like a dome
$III.$ Separates thoracic and abdominal cavity

Which structure is composed of yellow elastic cartilage?