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: growth occurs on the windward side of the mountain range. 
Question: What occurs on the windward side of a mountain range?
growth.

Fact: The evaporation of sweat occurs when a body is hot. 
Question: The evaporation of sweat occurs when what thing is hot?
body.

Fact: using a fossil fuel engine requires burning fossil fuels. 
Question: What does an engine require burning?

fossil fuels.