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: certain Steel products have a positive impact on the environment. 
Question: certain Steel products have a positive impact on what?
[EX A]: environment.

[EX Q]: Fact: marine and benthic creatures lack respiratory and excretory systems. 
Question: what creatures lack respiratory and excretory systems?
[EX A]: marine and benthic.

[EX Q]: Fact: the number of rings in a tree trunk can be used to estimate how many years old it is. 
Question: what unit of time can be estimated by the rings in a tree trunk?
[EX A]:
years.