| − | A mixture of [[salt|salts]] and [[phospholipids]] that aids in the breakdown of [[fat]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> | + | A mixture of [[salt|salts]] and [[phospholipids]] that aids in the breakdown of [[fat]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> The medieval theory of the four humors lists two kinds of bile (black and yellow). These represented the characteristics of choleric and melancholic personality types. |