Final answer:
The function not attributed to epithelial tissue is assimilation. Epithelial functions include protection, secretion, and absorption, but assimilation happens at the cellular level after absorption.
Step-by-step explanation:
The function of epithelial tissue that does not belong in the list is c. assimilation. Epithelial tissues have several key functions, which include absorption, secretion, protection, and transportation of substances. They serve as boundaries and play roles in protecting the body from the external environment, absorbing nutrients, secreting substances necessary for bodily functions, and facilitating transport across their surfaces. However, the process of assimilation - the conversion of nutrients into living tissue - is not a direct function of epithelial cells, but rather occurs after the nutrients have been absorbed and are utilized by the body's cells.