Science

What is the distance that light travels in a year called?

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When a dog repeats a learned behavior and gets a reward, what process is shown?
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What does one call a smaller stream that parallels a larger stream and finally enters the larger stream?
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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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What is it called when the Earth, Sun and Moon lie in a straight-line configuration?
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Which of these particles was discovered first?
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Who discovered the supernova and was the first to theorize that stars "die"?
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Who invented the most common bacterial medium?
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What does the scientific acronym BTU stand for?
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