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: One-celled animals can be partially classified on the basis of how they move. 
Question: Movement is one classification method for what?

Output: one-celled animals.


Input: Consider Input: Fact: Population size influences the chances of going extinct. 
Question: what influences the chances of going extinct?

Output: Population size.


Input: Consider Input: Fact: A chemical reaction involving rapid oxidation converts chemical energy into light and heat energy. 
Question: A chemical reaction involving what converts chemical energy into light and heat energy?


Output: rapid oxidation.