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.

[EX Q]: Fact: Earthworm burrows help aerate soil, which is essential for growing plants. 
Question: Earthworm burrows help aerate soil, which is essential for what?
[EX A]: growing plants.

[EX Q]: Fact: Insectivorous birds typically travel long distances. 
Question: Insectivorous birds typically do what?
[EX A]: travel long distances.

[EX Q]: Fact: Wiring requires a material such as copper or gold. 
Question: Wiring requires a material such as copper or what?
[EX A]:
gold.