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Question generated: When someone plays the flute, sound is produced because the air in the flute is

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Question generated: Which of the following represents a chemical reaction?

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Question generated: Photovoltaic cells capture photons of sunlight and transform them directly into electricity. Many of Earth's other energy resources are simply transformed solar energy. Which two energy resources store energy that did not begin as solar energy?

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Question generated:
Which characteristic is an example of learned behavior?