In rabbits,the lungs are lodged in:

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 outer wall of the guard cell in a sunflower is

The cartilages present in the larynx of a rabbit are:

Which structure is composed of yellow elastic cartilage?

Which organ is common to both the digestive and respiratory systems?