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: Food is used for energy by the cells of most organisms. 
Question: Food is used for energy by what part of most organisms?
answer:
Cells.


question:
Fact: Deep gorges are formed by flowing rivers through erosion over long periods of time. 
Question: What are formed by flowing rivers through erosion over long periods of time?
answer:
deep gorges.


question:
Fact: Crumpling paper changes the shape due to physical abuse. 
Question: crumpling paper changes the shape due to physical what?
answer:

abuse.