Science
What is the sticky bacteria that forms on teeth and gums?
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What is a long balloon filled with helium generally called?
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Which Apollo mission was launched on December 21, 1968, and spent Christmas in lunar orbit?
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What is matter that doesn't allow light to pass through called?
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What process refers to the joining of pollen with an ovule to form a seed?
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Which of these measurements of distance is the longest?
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Which aeronautical term is a moveable surface on an aircraft which controls its motion?
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