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: seismographs measure strength. 
Question: What does a seismometer measure?
[EX A]: waves.

[EX Q]: Fact: Invertebrates are animals that lack a support column. 
Question: Invertebrates are animals that lack a what?
[EX A]: support column.

[EX Q]: Fact: Moles find prey mainly by using their ability to sense pressure. 
Question: Moles find prey mainly by using their ability to sense what?
[EX A]:
pressure.