instruction:
Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.
question:
Fact: mammals are endothermic. 
Question: what are endothermic?
answer:
mammals.


question:
Fact: many plants respond to the days growing shorter in September by going dormant. 
Question: when do plants respond to shorter days by going dormant?
answer:
September.


question:
Fact: thirst is used to make humans realize they need to replenish bodily water. 
Question: what uses thirst to realize it needs to replenish bodily water?
answer:

humans.