instruction:
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.
question:
Fact: diet is an adaptation. 
Question: What is an adaptation?
answer:
diet.


question:
Fact: Each starfish arm contains part of the water vascular system. 
Question: Where does a starfish have its water vascular system?
answer:
in its arms.


question:
Fact: single-celled organisms have motility. 
Question: what do single-celled organisms have?
answer:

motility.