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: Solutions are formed when solvents are dissolved. 
Question: What is formed when solvants are dissolved?
Solutions.

Fact: if graptolites are found in a place then that place used to be covered by water. 
Question: what are found in place to indicate a place used to be covered by water?
graptolites.

Fact: aging is natural. 
Question: What is natural?

aging.