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.

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

Fact: predicting weather requires meteorology. 
Question: What requires meteorology?
predicting weather.

Fact: When consumed, energy is passed up from plants from lower to higher trophic levels. 
Question: At what trophic level is a plant?

lower trophic level.