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Several types of mechanisms in the body regulate the rate of chemical reactions in the digestive system. Among the most important are feedback systems, which control the release rate of

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Question generated: A chewable calcium carbonate tablet is a common treatment for stomach discomfort. Calcium carbonate is most likely used as this type of medicine because calcium carbonate

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

Answer: In large industrial cities, the emissions from fossil fuels cause the atmosphere to change. Which process allows the atmosphere to change?

question: Write a question you would see in a school textbook. OPTIONS:
- how fast light travels in space.
- the distance light travels in one year.
- how large the diameters of different stars are.
- the time it takes the Sun to move through the galaxy.
answer: Scientists use the term "light year" to describe

An example of a grad-school level question?
Scientists found fish fossils in the desert. What do the fossils tell about this environment when the fish were alive?

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Which of the following causes a ship's iron anchor to sink to the ocean floor when it is released overboard?