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: Animals in the class Reptilia are a class of tetrapod vertebrates that produce amniotic eggs.
What group of animals are a tetrapod vertebrate that produce amniotic eggs?

Fact: The leg straightens when muscle fibers get shorter.
What happens to your leg when muscle fibers shorten?

Fact: ice ages buried Earth in snow and ice for millions of years at a time.

what did ice ages bury in snow and ice for millions of years at a time?