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

What is the length of the pharynx (in $cm$)?

During the act of swallowing,which of the following structures prevents the food bolus from entering the glottis?

The trachea divides into left and right primary bronchi at the level of $-$

Analogy type questions:
$(1)$ Sponges,Coelenterates : Respiration through entire body surface :: Insects : ....
$(2)$ Larynx : Cartilaginous box :: Epiglottis : .......

Choose the incorrect statement.