Final answer:
Epithelial tissues are classified based on the shape of cells and the number of cell layers. The type of secretion is not used to classify epithelial tissue.
Step-by-step explanation:
Epithelial tissues are classified based on the shape of the cells and the number of cell layers. The options given in the question are:
- Type of secretion: This is not a manner in which epithelial tissue is classified. The type of secretion may vary among different tissues, but it is not used to classify epithelial tissue.
- Location: Epithelial tissues can be found in various locations in the body and this is one of the ways they are classified.
- Shape of the cells: Squamous, cuboidal, and columnar are the different shapes of epithelial cells, and this classification is based on their shape.
- Number of cell layers: Epithelial tissues can have a single layer of cells (simple epithelium) or multiple layers (stratified epithelium), and this is another important classification criterion.
Based on the information given, the answer is A) type of secretion.