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: roundworms may be free-living or live off a host. 
Question: aside from free-living, where else can roundworms exist?

Answer: live off a host.


Question: Fact: animals use glucose for energy. 
Question: what do animals use for energy?

Answer: glucose.


Question: Fact: Weathering means eroding rocks down into smaller pieces of minerals. 
Question: Weathering means eroding rocks down into what pieces of minerals?

Answer:
smaller.