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?"

Input: Consider Input: Fact: using a gasoline engine requires consuming gasoline.

Output: Using a gasoline engine requires doing what to gasoline?


Input: Consider Input: Fact: Deep gorges are formed by flowing rivers through erosion over long periods of time.

Output: What are formed by flowing rivers through erosion over long periods of time?


Input: Consider Input: Fact: There are many types of introns.


Output: How many types of introns are there?