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: When consumed, energy is passed up from plants from lower to higher trophic levels.

Output: At what trophic level is a plant?


Input: Consider Input: Fact: Hermit crabs use the shells of dead Gastropods  for homes.

Output: Hermit crabs use the shells of dead _ for homes.?


Input: Consider Input: Fact: cold is used for keeping food fresh for a long period of time.


Output: What used for keeping food fresh for a long period of time?