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: parasites can cause harmful diseases. 
Question: certain diseases can be caused by what?
parasites.

Fact: Evolution occurs by a sorting mechanism process. 
Question: How does evolution occur?
A sorting mechanism process.

Fact: Sonar is used to find other submarines. 
Question: What can sonar be used to find?

submarines.