What is polikilotherm?

Answer 1

A poikilotherm is an organism whose body temperature varies with the ambient environment, as they do not have the ability to regulate their internal temperature independently. This group includes most reptiles, amphibians, and fish, which rely on external heat sources to maintain their metabolic functions. Unlike homeotherms, which maintain a constant body temperature, poikilotherms adapt their behaviors and physiological processes based on temperature changes in their surroundings.