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: Roots will decay is the conditions for growth aren't favorable. 
Question: What will decay is the conditions for growth aren't favorable?
answer:
roots.


question:
Fact: AIDS infects and destroys helper T cells. 
Question: what infects and destroys helper T cells?
answer:
AIDS.


question:
Fact: Carbon dioxide concentrations in the air have increased over the last 10 years dramatically. 
Question: Concentrations of what in the air have increased over the last 10 years dramatically?
answer:

carbon dioxide.