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.

Input: Consider Input: Fact: Vertebrates have a complete digestive system and a closed circulatory system. 
Question: vertebrates have a complete digestive system and a what?

Output: closed circulatory system.


Input: Consider Input: Fact: if heat is conducted to an object that object will emit more energy. 
Question: If heat is conducted to an object what will that object do?

Output: Emit more energy.


Input: Consider Input: Fact: A prism is used for refracting energy. 
Question: What is used for refracting energy?


Output: a prism.