Science
Which of the following happens when air cools?
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Who discovered that a moving magnet generates electric current known as electromagnetic induction?
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What is the part of a plant that serves primarily as the plant's food-making organ?
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Discovered by Alexander Fleming, what is now used to treat infections?
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What type of circulatory system pumps blood into cavities instead of through vessels?
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What space object did some ancient cultures rely on to tell the passage of time?
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