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: Beavers help lakes to form. 
Question: What animal can help lakes to form?
[A]: The beaver.


[Q]: Fact: nerves endings can feel cold. 
Question: What can nerve endings feel?
[A]: cold.


[Q]: Fact: Most animals without a backbone have a complex nervous system. 
Question: Most animals without a backbone have what?
[A]:
Complex nervous systems.