Question

where you can see simple sum of epithelial​

Answer 1

Epithelial cells are a specialized component of many organs. They are characterized by common structural features, especially their arrangement into cohesive sheets, but have diverse functions made possible by many specialized adaptations. Many of the physical properties of epithelial cells rely on their attachment to each other, which is mediated by several types of cell junctions. The specialized functions of epithelial cells are mediated both through structural modifications of their surface and by internal modifications, which adapt cells to manufacture and secrete a product.

PLEASE MAKE ME AS A BRAINLIST ANSWER