sentence2_structure: Reptiles<>are described<>by the term ectothermic$$$the term ectothermic<>means<>their internal temperature depends on the temperature of their environment$$$their internal temperature<>depends<>on the temperature of their environment
sentence1: All reptiles grow throughout their lives and are ectothermic, or dependent on external heat for regulating body temperature.
sentence2: Reptiles are described by the term ectothermic, which means their internal temperature depends on the temperature of their environment.
question: Reptiles are described by what term that means their internal temperature depends on the temperature of their environment?