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: Damming a river can cause something with fresh water to form. 
Question: What is the thing that is created by damming a river made of?
answer:
Fresh water.


question:
Fact: mammals prevent death with the help of a diaphragm. 
Question: What do mammals use a diaphragm for?
answer:
Preventing death.


question:
Fact: If you want to see details of a star you need a telescope. 
Question: What could help you see closer details of a star?
answer:

telescope.