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: looking at the Sun has a negative impact on the eyes.
Looking at what has a negative impact on the eyes?

Fact: sperm had to swim from male to female reproductive organs for pregnancy.
what does sperm have to swim from male to female reproductive organs for?

Fact: Mouse-sized viviparous mammals evolved by Jurassic times.

By what time had mouse-sized viviparous mammals evolved?