Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Example Input: Unlike ammonia, oxygen cannot be liquefied at room temperature because its critical temperature is below room temperature.
Example Output: Unlike ammonia, oxygen cannot be liquefied at room temperature because its what is below room temperature?

Example Input: Bees are naturalized on every continent except antarctica.
Example Output: Bees are naturalized on every continent except which?

Example Input: Cloud of these can make a shadow on the ground during the day.
Example Output:
Which of these can make a shadow on the ground during the day?