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: climate influences bush growth. 
Question: what growth does climate influence?
bushes.

Fact: Digestion is the process of breaking down food proteins into energy or heat. 
Question: What is the process of breaking down food proteins into energy or heat?
digestion.

Fact: the smallest agents of disease are not cells. 
Question: what are not cells?

smallest agents of disease.