Regarding the classification and types of Epithelial Tissue, which of the following statements are accurate?
a. All complex animals consist of only four basic types of tissues: Epithelial, Connective, Muscular, and Neural.
b. Epithelial tissue has a free surface that faces either a body fluid or the outside environment.
c. Simple epithelium is composed of two or more cell layers and functions as a lining for body cavities.
d. Compound epithelium consists of a single layer of cells and has a protective function.
e. Squamous epithelium is made of a single thin layer of flattened cells with irregular boundaries, found in the walls of blood vessels.
f. Cuboidal epithelium is commonly found in the ducts of glands and tubular parts of nephrons, with main functions of protection and diffusion.
g. The epithelium of the Proximal Convoluted Tubule (PCT) in the kidney has microvilli.
h. Columnar epithelium is composed of a single layer of cube-like cells with nuclei located at the base.
