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 Input:
Fact: warblers are nocturnal and travel long distances at night. 
Question: What are nocturnal and travel long distances at night?

Ex Output:
warblers.


Ex Input:
Fact: fluid connective tissue carries oxygen. 
Question: What does fluid connective tissue carry?

Ex Output:
oxygen.


Ex Input:
Fact: some invertebrates are protected by a hard shell on their backs. 
Question: What are some invertebrates protected by on their backs?

Ex Output:

shells.