The type of epithelial tissue that is only one cell-layer thick is called __________; the type of epithelial tissue that is two or more cell-layers thick is called _________.
a) Simple epithelium; Stratified epithelium
b) Squamous epithelium; Cuboidal epithelium
c) Columnar epithelium; Transitional epithelium
d) Pseudostratified epithelium; Cuboidal epithelium
