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

Ex Input:
A fewer predators is most likely to cause the number of rabbits living in an area to increase.

Ex Output:
Which factor is most likely to cause the number of rabbits living in an area to increase?


Ex Input:
Sexually do invertebrates reproduce.

Ex Output:
How do invertebrates reproduce?


Ex Input:
Work is what it is called when a charge moves against a field.

Ex Output:

What is it called when a charge moves against a field?