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

Fact: pines have a positive impact on an ecosystem. 
Question: what has a positive impact on an ecosystem?
pines.

Fact: cows can communicate with sounds, chemicals or visual cues. 
Question: what can communicate with sounds, chemicals or visual cues?

cows.