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?"
--------
Question: Fact: cloth-edged screens are used for separating mixtures.

Answer: what are used for separating mixtures?


Question: Fact: Building housing developments usually requires endangering numerous plant and animal species.

Answer: Building housing developments usually requires doing what to numerous plant and animal species?


Question: Fact: a pie chart can be used to display percents.

Answer:
What can pie charts be used to display?