Which protein provides color to the body?

Which of the following is an example of a merocrine gland?

Nails,horns,and hooves are composed of ........

Which type of epithelial tissue is found in the conjunctiva of the eye?

$A$ 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 inner lining of the stomach, liver, and alimentary canal is made up of which type of epithelium?