From which of the following do epithelial tissues originate?

The secretory part of the sweat glands is composed of which type of epithelium?

Stratified epithelial cells have a limited role in secretion. Justify their role in our skin.

Ciliated columnar epithelial cells in humans are found in . . . . . . .

Read the following statements and answer the question.
$(i)$ It is made of a single thin layer of flattened cells with irregular boundaries.
$(ii)$ They are found in the walls of blood vessels and air sacs of lungs.
$(iii)$ They are involved in functions like forming a diffusion boundary.
Which of the following characteristics of tissue is being described by the above statements?

Reproductive cells $(germinal\ \text{epithelium})$ are made up of which of the following epithelial tissue?