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?"

[Q]: Fact: when a hemisphere is tilted away from our nearest star, the hemisphere receives less direct sunlight.
[A]: What does the hemisphere have to be tilted away from to receive less sunlight?


[Q]: Fact: digestive systems are needed to keep cells alive.
[A]: What do cells need to keep them alive?


[Q]: Fact: fluid in the inner ear is used for sensing sound by animals.
[A]:
what in the inner ear is used for sensing sound by animals?