The sound-producing organ of a bird is:

What is the function of the epiglottis?

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

In a rabbit,the lungs are divided into how many lobes?

What are the membranes covering the lungs called?

'$XX$' is a part of the respiratory system that contains $C$-shaped rings of hyaline cartilage. '$XX$' is lined with ciliated,pseudostratified columnar epithelium. Identify '$XX$'.