1- Epithelia: A. Can be of mesenchymal origin B. Are always made up of a single cell layer. C. Rest on a basement membrane. D. Are vascularized and innervated. E. Never renew themselves. F. Are always made up of several cell layers. G. Do not renew themselves. H. Can be of mesoblastic origin

The answer to the question is as follows:

A. False - Epithelia are not of mesenchymal origin. They are derived from all three germ layers: ectoderm, endoderm, and mesoderm.

B. False - Epithelia can be either simple (single cell layer) or stratified (multiple cell layers).

C. True - Epithelial tissues do rest on a basement membrane. This is a defining characteristic of epithelial tissue.

D. False - Epithelial tissues are avascular, meaning they do not have their own blood supply. They are innervated, however.

E. False - Epithelial cells do have the ability to renew themselves. This is especially evident in areas of the body where cells are frequently lost, such as the skin.

F. False - As mentioned in B, epithelial tissues can be either simple or stratified.

G. False - As mentioned in E, epithelial cells do have the ability to renew themselves.

H. True - Epithelial tissues can be of mesoblastic (mesodermal) origin. For example, the epithelium lining the body cavities and the epithelium lining the heart, blood vessels, and lymphatic vessels are derived from mesoderm.