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Question generated: During an experiment, a student reports that a liquid turned green when mixed with another liquid. This is an example of

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Question generated: Which of the following would be more likely to pollute a river?

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Question generated: A hillside along a highway has exposed layers of undisturbed sedimentary rock. Which method would be best for scientists to use to determine the relative age of these sedimentary rock layers?

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Question generated:
Which system absorbs and carries food from the digestive system to the rest of the body?