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: The earliest vertebrates were jawless fish.

Output: What were the earliest vertebrates who has relatives today?


Input: Consider Input: Fact: Gases from burning coal and oil dissolving in water in the atmosphere causes polluted rain.

Output: Gases from burning coal and and oil dissolving in the atmosphere can cause what?


Input: Consider Input: Fact: Freshwater ecosystems are one of the more important environments.


Output: What is a very important ecosystem on earth?