What structural feature do epithelia that provide for protection have in common?

Epithelial tissue constitutes an uninterrupted and continuous layer of cells. They form the linings of organs and body cavities for the protection. Epithelial cells are polarized with an apical surface which opposes the lumen of a tube or the external environment and a basal surface that attaches to the basal lamina. The epithelial tissues are specialized mainly for four functions, one of those function is protection, for this purpose they themselves are being Supported by the Connective Tissues. Epithelial cells are continuously renewed and these cells regenerate themselves with the help of mitosis. Cell linkages are well-employed in epithelial tissues.

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you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.