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In biology, an organism is called ectothermic if it lacks an internal mechanism for regulating body heat.[1] Thus ectothermic organisms must gain body heat through sunlight such as by sun basking. The misnomer "cold blooded" means ectothermic. The most well-known ectothermic organisms are amphibians and reptiles.

See also


  1. Wile, Dr. Jay L. Exploring Creation With Biology. Apologia Educational Ministries, Inc. 1998