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

Q: Compounds containing an atom of nitrogen element, bonded in a hydrocarbon framework, are classified as amines.

A: Compounds containing an atom of what element, bonded in a hydrocarbon framework, are classified as amines?
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Q: Unlike ammonia, oxygen cannot be liquefied at room temperature because its critical temperature is below room temperature.

A: Unlike ammonia, oxygen cannot be liquefied at room temperature because its what is below room temperature?
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Q: The cytoskeleton holds cell organelles in place within the cytoplasm.

A:
What part of the cell holds cell organelles in place within the cytoplasm?
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