Task: Paraphrasing
Input (English): Question: Reptiles are described by what term that means their internal temperature depends on the temperature of their environment? 
Answer: ectothermic. 
Sentence: Reptiles are described by the term ectothermic, which means their internal temperature depends on the temperature of their environment.
Output (English): when internal temperature depends on the temperature of their environment, it is ectothermic, which is what reptiles are.