The upper respiratory system in human beings includes all of the following parts $EXCEPT$ . . . . . . .

Identify the component of the respiratory system which displays the features given below and choose the correct option:
$I.$ Double layered
$II.$ Fluid contained in it reduces the friction on the lung surface
$III.$ Its outer layer is in contact with the thoracic wall
$IV.$ Its inner layer is in contact with the lungs

The correct sequence of the following parts of the lower respiratory system is:
$I.$ Bronchi $\quad$ $II.$ Larynx
$III.$ Bronchioles $\quad$ $IV.$ Alveolus

Where are lungs situated in the human body?

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

The lungs are composed of $........$.