TASK DEFINITION: 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.
PROBLEM: Fact: most bigger cities require vehicles. 
Question: What do most bigger cities require?

SOLUTION: vehicles.

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

SOLUTION: A sorting mechanism process.

PROBLEM: Fact: freezing causes ice to form. 
Question: What causes ice to form?

SOLUTION:
freezing.