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 Input:
Fact: Fossils are remnants of ancient life. 
Question: What ancient life remnants are studied?

Ex Output:
fossils.


Ex Input:
Fact: bottom dwelling organisms can be filter feeders. 
Question: What can bottom dwelling organisms be?

Ex Output:
filter feeders.


Ex Input:
Fact: a measuring cup is used for measuring the density of a substance. 
Question: a measuring cup is used for measuring the what?

Ex Output:

density of substances.