Turn the given fact into a question by a simple rearrangement of words. This typically involves replacing some part of the given fact with a WH word. For example, replacing the subject of the provided fact with the word "what" can form a valid question. Don't be creative! You just need to rearrange the words to turn the fact into a question - easy! Don't just randomly remove a word from the given fact to form a question. Remember that your question must evaluate scientific understanding. Pick a word or a phrase in the given fact to be the correct answer, then make the rest of the question. You can also form a question without any WH words. For example, "A radio converts electricity into?"

[EX Q]: Fact: cigars cause direct damage to the lungs.
[EX A]: what causes direct damage to the lungs?

[EX Q]: Fact: pollution has a negative impact on the population size of a species.
[EX A]: What has a negative impact on a species population size?

[EX Q]: Fact: Keeping food fresh for a long period of time is a major user of electricity.
[EX A]:
Keeping food fresh is a major user of what?