Which mechanism do ectotherms NOT use for thermoregulation?

Ectotherms, such as reptiles and amphibians, primarily rely on external environmental sources for temperature regulation rather than generating their own body heat through metabolic processes like endotherms do. Therefore, they do not utilize metabolism as a mechanism for thermoregulation. Instead, ectotherms depend on physical processes such as evaporation, convection, and conduction to manage their body temperature.

Evaporation helps cool the body through moisture loss, convection allows heat exchange with the surrounding air or water, and conduction involves direct heat transfer through contact with surfaces. These methods play a crucial role in how ectotherms maintain their body temperature in response to environmental changes.