A measure of the mass of organisms within a region divided by the area of that region.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
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A measure of the [[mass]] of [[organ|organisms]] within a region divided by the area of that region.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>