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

Ex Input:
The combustion of propane gas produces carbon dioxide and water vapor.

Ex Output:
The combustion of propane gas produces carbon dioxide and what else?


Ex Input:
The size and symmetry of a beetle’s or an elk’s antlers or a grasshopper’s song communicate rather clearly their state of health.

Ex Output:
The size and symmetry of a beetle’s or an elk’s antlers or a grasshopper’s song communicate rather clearly their state of what?


Ex Input:
The large central vacuole store water.

Ex Output:

What does the large central vacuole do?