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.

Example Input: Fact: erosion forms canyons. 
Question: What are formed by erosion?
Example Output: canyons.

Example Input: Fact: a greenhouse protects plants from death. 
Question: What does a greenhouse protect plants from?
Example Output: death.

Example Input: Fact: Gene flow occurs when people move into or out of a population. 
Question: What happens when people flow into or out of a population?
Example Output:
gene flow.