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: Mammals took advantage of an asteroid impact. 
Question: What took advantage of an asteroid impact?
[EX A]: mammals.

[EX Q]: Fact: Roots will decay is the conditions for growth aren't favorable. 
Question: What will decay is the conditions for growth aren't favorable?
[EX A]: roots.

[EX Q]: Fact: Ionization harms aquatic ecosystems. 
Question: What is most likely harmful to aquatic ecosystems?
[EX A]:
Ionization.