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.

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

Fact: the average number of individuals per unit of area affect the balance of the environment. 
Question: The average number of individuals per unit of area affect the balance of .?
the environment.

Fact: detailed observation of distances to stars requires a telescope. 
Question: detailed observation of stars what requires a telescope?

distance.

