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: Distilling water removes harmful substances before drinking. 
Question: Distilling water removes what before people drink it?
[EX A]: harmful substances.

[EX Q]: Fact: amoebae have motility. 
Question: what have motility?
[EX A]: amoebae.

[EX Q]: Fact: fish have a protective covering called the chondral skull. 
Question: What do fish have as a protective covering?
[EX A]:
chondral skull.