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: a source of nutrients consists of organic molecules that store energy in their chemical bonds. 
Question: What consists of organic molecules that store energy in their chemical bonds?
[EX A]: source of nutrients.

[EX Q]: Fact: the excretory system is part of the life process. 
Question: What is part of the life process?
[EX A]: Excretory system.

[EX Q]: Fact: Ecosystems are damaged by sulfur dioxide. 
Question: What causes damage to forest ecosystems?
[EX A]:
Sulfur dioxide.