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

[EX Q]: Tornadoes can occur in any.
[EX A]: At what time of the year can tornadoes occur?

[EX Q]: The tilt of earth on its axis is one factor that contributes to seasons occurring in new york state.
[EX A]: What is one factor that contributes to seasons occurring in New York State?

[EX Q]: Ion channels facilitate(s) the diffusion of ions across a membrane.
[EX A]:
What facilitates the diffusion of ions across a membrane?