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.

[Q]: Fact: The direction the earth is tilted while it orbits the sun is what causes climate to change. 
Question: What determines the climate to change?
[A]: The way the earth is tilted.


[Q]: Fact: many plants respond to the days growing shorter in September by going dormant. 
Question: when do plants respond to shorter days by going dormant?
[A]: September.


[Q]: Fact: Catalysts lower the input required for chemical reactions to get started. 
Question: Catalysts lower the input required for chemical reactions to what?
[A]:
get started.