Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: The mesopause is at the top of the mesosphere.

Answer: What is at the top of the mesosphere?

Question: You see a faster reaction rate when the concentration of reactants is higher.

Answer: What kind of reaction do you see when the concentration of reactants is higher?

Question: Bacteria and archaea are examples of prokaryotes.

Answer:
What are bacteria and archaea examples of?