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Question generated: Which illness is always caused by an infection?

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Question generated: At some places in Florida, sand on the beaches is being reduced. New sand is brought from other areas and spread on the beaches. What process causes this reduction to the beach sand?

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Question generated: NASA's Kepler Mission has collected information about main-sequence stars with characteristics similar to the Sun. What is the most common color of these stars?

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Question generated:
Which ability is the most useful for making observations?