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?"

Fact: the largest group of animals are insects.
what is the largest group of animals?

Fact: Something critical for regulating oxygen from hemoglobin may become unbalanced if the rate of breathing is too fast or too slow.
Something critical for regulating oxygen from hemoglobin may become unbalanced if breathing is what?

Fact: bears can keep warm.

What keeps warm?