| − | A cell wall is a rigid substance on the outside of certain cells, usually plant and bacteria cells.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> | + | A cell wall is a rigid substance on the outside of certain [[cell|cells]], usually [[plant]] and [[bacteria]] cells.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> |