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

Ex Input:
Atoms of metals are good conductors of electricity because they give up electrons.

Ex Output:
Why are atoms of metals good conductors of electricity?

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:
Earth revolves around the sun once per year of the following happens in our solar system.

Ex Output:
Which of the following happens in our solar system?