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A chemical substance essential for the normal working of the human body.<ref>Wile, Dr. Jay L. ''Exploring Creation Through General Science''. Anderson: Apologia Educational Ministries, Inc.
A chemical substance essential for the normal working of the human body.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc.
2000</ref>
2000</ref>