Animal tissue consisting of one or more layers of cells that have only one free surface, because the other surface adheres to a membrane or other substances.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
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Animal tissue consisting of one or more layers of cells that have only one free surface, because the other surface adheres to a membrane or other substance.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>