Which tissue has the power of division and regeneration throughout life?

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?

Describe various types of epithelial tissues with the help of labelled diagrams.

Where is non-keratinized stratified squamous epithelium found?

In which one of the following preparations,cell junctions come across most frequently?

Which tissue is present in the inner lining of the nasal passage,bronchi,and fallopian tubes?