| − | Lacking an internal mechanism for regulating body heat.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
| + | In biology, an [[organism]] is called ectothermic if it lacks an internal mechanism for regulating body heat.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> More generally, an ectothermic process is any process that produces [[heat]]. |