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.

Example Input: Fact: boulders are formed by snow, ice, and rock melting sometimes. 
Question: what melts sometimes to form boulders?
Example Output: snow, ice, and rock.

Example Input: Fact: dogs require nutrients to grow and heal. 
Question: what requires nutrients to grow and heal?
Example Output: dogs.

Example Input: Fact: A macronucleus and micronucleus are contained with the basic structural and functional unit of living things. 
Question: What is contained within the basic structural and functional unit of living things?
Example Output:
macronucleus and micronucleus.