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

[EX Q]: All cells have the small size in common.
[EX A]: What do all cells have in common?

[EX Q]: Most ferns produce the same type of spores and are therefore called homosporous.
[EX A]: Most ferns produce the same type of spores and are therefore called what?

[EX Q]: Electric motors transform electrical energy into kinetic energy.
[EX A]:
Electric motors transform electrical energy into what other form of energy?