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

[EX Q]: Unlike ammonia, oxygen cannot be liquefied at room temperature because its critical temperature is below room temperature.
[EX A]: Unlike ammonia, oxygen cannot be liquefied at room temperature because its what is below room temperature?

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

[EX Q]: Prokaryotic cells' organelles because not membrane-bound.
[EX A]:
What are unique about prokaryotic cells' organelles?