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

Ex Input:
Under a crushed sugar cube is added and the water is stirred conditions would a sugar cube dissolve most quickly when placed in a liter of water at room temperature.

Ex Output:
Under which conditions would a sugar cube dissolve most quickly when placed in a liter of water at room temperature?


Ex Input:
It takes about one year for earth to orbit the sun.

Ex Output:
Which of these takes about one year to complete?


Ex Input:
Most have cells that are not able to exchange gases with the outside environment do multicellular organisms need transport systems.

Ex Output:

Why do multicellular organisms need transport systems?