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

[Q]: Producers in an ecosystem generally get their energy from the sun.
[A]: Where do producers in an ecosystem generally get their energy from?


[Q]: All enzymes have an optimal temperature and ph.
[A]: All enzymes have an optimal temperature and what?


[Q]: Increasing the distance between the two magnets will cause a decrease in the force of attraction between two magnets.
[A]:
Which factor will cause a decrease in the force of attraction between two magnets?