When defining epithelial consider two criteria, one, the number of cell layers and two, the shape of the cells on the free surface. When an epithelium has a single layer of cells, it is called a simple epithelium, whereas multiple tiers of cells are known as stratified epithelium. There are pseudostratified epithelium, which is single layered but appears to be stratified because the cells vary in length. The free surface of epithelium cells are shaped as cubiodal, columnar, or squamous. As well as keeping the organs in line, epithelia absorb or secrete chemical solutions.
Connective tissue is animal tissue that functions mainly to bind and support other tissues.
They have sparse populations of cells scattered through an extracellular matrix. This extracellular matrix is a web of fibers that is woven in a homogeneous ground substance that can be liquid, solid or jellylike. The matrix of the cells is usually secreted by the connective tissue. There are a few major types of connective tissue. A few of these are loose connective tissue, adipose tissue, and fibrous connective tissue has a specific function that is correlated to its structure.