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: Any surface that has not been sterilized is likely to be covered with microscopic organisms.
What is any surface that has not been sterilized likely to be covered with?

Fact: the cells way of reproducing is more complex in eukaryotes than prokaryotes.
the cells way of reproducing is what in eukaryotes than prokaryotes?

Fact: Animals require hydrogen and oxygen for survival.

which are required for animal survival?