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: heating salt water leaves the salt on the surface. 
Question: heating salt water leaves the salt where?
answer:
on the surface.


question:
Fact: roots have different meristems. 
Question: What do roots have?
answer:
meristems.


question:
Fact: plants exhibit phototropism, or growing towards the sun. 
Question: What behavior do plants exhibit that makes them grow towards the sun?
answer:

phototropism.