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

[EX Q]: Pressure and vibration are examples of physical type of stimuli.
[EX A]: Pressure and vibration are examples of what type of stimuli?

[EX Q]: In the tropics tradewinds are the prevailing winds called.
[EX A]: In the tropics what are the prevailing winds called?

[EX Q]: Living organisms are comprised of organic compounds, which are molecules built around carbon.
[EX A]:
Living organisms are comprised of organic compounds, which are molecules built around what element?