A. Epithelial Tissue
Cells line an internal or external surface.
Each cell touches neighboring cells.
Cells are organized into rows, layers, or sheets.
B. Connective Tissue
Cells do not usually line a surface.
Cells are usually separated from most neighboring cells by matrix or fibers. (Exception: adipose cells seem to be touching each other.)
Cells are not organized into rows, layers, or sheets.