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: if soil is permeable then h2o easily flows through the soil. 
Question: what flows with ease through soil if it's permeable?
answer:
h2o.


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: the last stage of life before adulthood is very complex. 
Question: what is the last stage like before adulthood?
answer:

very complex.