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: Toyota causes pollution. 
Question: What causes pollution?
[EX A]: Toyota.

[EX Q]: Fact: cloning is the process of isolating and making copies of a unit of heredity. 
Question: What is the process of isolating and making copies of a unit of heredity?
[EX A]: cloning.

[EX Q]: Fact: changes in successive generations of a species occur in response to a change in the environment. 
Question: Change happens to what of a species in response to changes in the environment?
[EX A]:
successive generations.