instruction:
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.
question:
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?
answer:
mammals.


question:
Fact: a stove is used in an alchemical process by generating heat. 
Question: what is a stove generating heat used for?
answer:
alchemical process.


question:
Fact: Something that comes in pairs are organelles involved in cell division. 
Question: Organelles involved in cell division come in what groups?
answer:

Pairs.