Question

What is the advantage of several layers of squamous epithelium rather than one thicker single layer of columnar epithelial cells in a place such as the surface of the skin?

Answer 1

1) during any injury in a one cell thick squamous epithelium layer it would be difficult to recover for a single cell and will cause many problem. But several layers of squamous epithelium has many cells which have high power of regeneration and it would take less time to recover
2) several layers in squamous epithelium make possible for many ducts of skin glands like subecious and sweat gland to enter in. But one cell thick layer would not provide easy passage for ducts