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: competition helps species survive. 
Question: What helps species survive?
competition.

Fact: When vapor moves from bushes into the atmosphere, transpiration occurs. 
Question: What happens when vapor moves from bushes into the atmosphere?
transpiration.

Fact: Resistors are used to convert energy into heat to heat buildings. 
Question: What is used to convert energy into heat?

A resistor.