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

[Q]: The energy stored in the organic molecules of food ultimately comes from the sun.
[A]: The energy stored in the organic molecules of food ultimately comes from where?

[Q]: Fermat's principle states that light will always take the path of the least amount of time.
[A]: Fermat's principle states that light will always take the path of least amount of?

[Q]: Most of a mushroom's surface area is actually underground.
[A]:
Most of a mushroom's surface area is actually where?