premise: Like all reptiles , tuatara are ectothermic, meaning that their body temperature fluctuates according to the environmental temperature , rather than being maintained internally.
hypothesis: Reptiles are described by the term ectothermic, which means their internal temperature depends on the temperature of their environment.
hypothesis_graph_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