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: marine and benthic creatures lack respiratory and excretory systems. 
Question: what creatures lack respiratory and excretory systems?

Output: marine and benthic.


Input: Consider Input: Fact: When heat passes through metal, that metal expands. 
Question: What happens to metal when heat passes through it?

Output: It expands.


Input: Consider Input: Fact: In order to ski, it is necessary to maintain body position. 
Question: What can maintaining body position help you to do?


Output: ski.