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: Disease-causing tiny living cells have a negative impact on the body. 
Question: What can cause disease, and have a negative impact on the body?
Tiny living cells.

Fact: Beavers cause ponds and lakes to form. 
Question: What can be the cause of lakes and ponds forming?
beavers.

Fact: Fire requires activation energy to get started. 
Question: What does fire require to get started?

activation energy.