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Why are scientists concerned about the depletion of the ozone levels in the stratosphere?
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Earth is tilted on its axis. which of these would not exist if earth had no tilt?
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Biology, 22.06.2019 22:00
In the 1500s, an astronomer developed a new model of the universe. this model had the sun at the center of the universe, not earth. who was this astronomer?
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What results if a fragment of a chromosome breaks off and then reattaches to the original chromosome...
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