Answer:a. make up the inner layers of connective tissue
Explanation:Epithelial cell are cell made up of inner connective tissues. This tissues helps in absorption of nourishment/ nutrient needed by the epithelial tissue.
They are arranged into sheet and joined to each other. This special properties aids it function.
Epithelial cell have modified surface structurally and through internal modifications this aids there ability for absorption and secretion of some glands such as liver, digestive tract and also act as barrier.
They form a sheet of cell called epithelia that serves as linning for body surfaces.
They can be classiified into three bases the shape on how the cells are packed;
Squamous epithelium- They are usually wider. They can be found in blood vessels
Cuboidal epithelium are almost similar in height and width
Columnar exceptionally are Tall and wide.