Final answer:
The A. cellular membrane with a liquid substance that helps epithelial tissue connect to connective tissue is called the epithelial membrane. It is composed of epithelium attached to a layer of connective tissue.
Step-by-step explanation:
The A. cellular membrane with a liquid substance that helps epithelial tissue connect to connective tissue is called the epithelial membrane. This membrane is composed of epithelium attached to a layer of connective tissue. It can be found in various parts of the body, such as the skin and the lining of body cavities.