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: water vapor condensing in the clouds causes soil to moisten. 
Question: what does water vapor condensing in the clouds cause?
[A]: moist soil.


[Q]: Fact: Machines can cause objects to change shape. 
Question: What can cause objects to change shape?
[A]: Machines.


[Q]: Fact: Starfish, sea urchins and sea cucumbers lack a centralized nervous system. 
Question: Starfish, sea urchins and sea cucumbers lack a what?
[A]:
centralized nervous system.