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: sponges have flagellum.
What has a flagellum?

Fact: water causes light rays to bend.
What happens to light rays in water?

Fact: insect are important in the fertilization step in the sexual reproduction of plants.

What are important in the fertilization step in the sexual reproduction of plants?.?