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: Ejaculation occurs when muscle contractions propel male gametes.
[EX A]: What occurs when muscles contract and propel male gametes?

[EX Q]: Fact: erosion can cause  crevasses.
[EX A]: erosion can cause?

[EX Q]: Fact: Black holes form from stars with relatively short lives.
[EX A]:
Which type of star is most likely to end up as black hole?