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

Example Input: Constant random motion trait of particles causes even cold objects to have some thermal energy.
Example Output: Which trait of particles causes even cold objects to have some thermal energy?

Example Input: The sporophyte stage is the dominant stage of the lifecycle of a fern.
Example Output: Which is the dominant stage of the lifecycle of a fern?

Example Input: No lungs do fish have short esophaguses.
Example Output:
Why do fish have short esophaguses?