Question

the two major types of epithelial cell layers are
○ simple and stratified.
○ stratified and pseudostratified.
○ simple and proper.
○ cuboidal and columnar.
○ squamous and simple.

Explanation:

To determine the two major types of epithelial cell layers, we recall the classification of epithelial tissue based on the number of cell layers. Epithelial tissue is primarily classified by the number of layers as simple (one layer) and stratified (multiple layers). Pseudostratified is a type of simple epithelium (appears stratified but is not), "proper" is not a standard layer classification, cuboidal and columnar are cell shapes (not layer types), and squamous is a cell shape while simple is a layer type, so they don't form the two major layer types. Thus, the correct pair is simple and stratified.

Answer:

A. simple and stratified.