Here's why:

* High Turnover Rate: Epithelial tissues line the surfaces of the body (skin, lining of organs, etc.) and are constantly exposed to wear and tear. They need to replace damaged or lost cells frequently.

* Active Cell Division: The cells in epithelial tissue are highly specialized for cell division (mitosis). They have a short cell cycle and a high rate of proliferation.

* Examples: Examples of epithelial tissues with high mitotic rates include the epidermis (outer layer of skin), the lining of the digestive tract, and the lining of the respiratory system.

Other tissues that also undergo mitosis at a relatively high rate include:

* Bone marrow: Produces blood cells.

* Hair follicles: Responsible for hair growth.

* The lining of the reproductive organs: Essential for the production of gametes (sperm and eggs).

While these tissues undergo mitosis, epithelial tissues generally have the highest rate of cell division.