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?"

Input: Consider Input: Fact: a thinning and weakening of bone is a disease in which osteoclasts are more active than osteoblasts.

Output: a thinning and weakening of bone is a disease in which osteoclasts are more active than what?


Input: Consider Input: Fact: reefs are built by organisms that usually reproduce asexually.

Output: What are built by organisms that usually reproduce asexually?


Input: Consider Input: Fact: tissue made of keratin is used for feeling by animals.


Output: Tissue made of  what is used for feeling by animals?