Where is the stratified squamous epithelium found?

The four sketches $(A, B, C$ and $D)$ given below represent four different types of animal tissues. Which one of these is correctly identified in the options given,along with its correct location and function?

The epithelium of the retina and the thyroid gland is composed of which type of cells?

$A$ student was given a sample of tissue. He observes and concludes the following characters.
$(i)$ The cells are composed of a single layer of tall and slender cells.
$(ii)$ Their nuclei are located at the base.
$(iii)$ Free surface may have microvilli.
$(iv)$ It is found in the lining of stomach and intestine.
$(v)$ They help in secretion and absorption. Based on the above features identify the epithelium.

The type of epithelium found in the conjunctiva of the eye is:

What is the function of a gap junction?