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: climate influences bush growth. 
Question: what growth does climate influence?
answer:
bushes.


question:
Fact: Population size influences the chances of going extinct. 
Question: what influences the chances of going extinct?
answer:
Population size.


question:
Fact: propulsion is used for flying by Apollo 13. 
Question: what uses propulsion for flying?
answer:

Apollo 13.