instruction:
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: Bacteria are single-celled organisms that lack a nucleus.
answer:
What are single-celled organisms that lack a nucleus?


question:
Fact: Fluoride reduces cavity formation.
answer:
What element can help prevent cavities?


question:
Fact: An organism that plays a big role as an aquatic producer is:.
answer:

What is an important aquatic producer?