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.

[Q]: Fact: Creatures with feathers and wings have a large brain relative to the size of their body. 
Question: Creatures with feathers and wings have a large brain relative to the size of their what?
[A]: body.


[Q]: Fact: Breathing provides one substance transported by the blood. 
Question: What process provides one substance transported by the blood?
[A]: breathing.


[Q]: Fact: a glacier causes the physical breakdown of rocks. 
Question: What causes the physical breakdown of rocks?
[A]:
glaciers.