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According to Darwin's theory of evolution, the variations among finches that he observed in the Galapagos Islands resulted from

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Question I was asked: Infectious diseases are caused by

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What happens when water flows over a rock for a long period of time?

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Question generated: The Theory of Plate Tectonics revolutionized scientific thought because it

Problem: Write a question you would see in a school textbook.

Answer: A student wants to look under a heavy rock. Which simple machine would be BEST to use to lift the rock?

Problem: Write a question you would see in a school textbook.

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When stratospheric ozone levels are reduced, the amount of ultraviolet radiation hitting Earth increases. Ozone depletion is most often caused