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.

[EX Q]: Fact: large animals that roamed the earth were replaced with mammals after their extinction. 
Question: large animals that roamed the earth were replaced with what after their extinction?
[EX A]: mammals.

[EX Q]: Fact: chromosome duplication occurs when cell division produces gametes. 
Question: chromosome duplication occurs when cell division does what?
[EX A]: produces gametes.

[EX Q]: Fact: Cells are the microscopic building bricks of organisms. 
Question: Cells are the microscopic building bricks of what?
[EX A]:
organisms.