Science
What is the repeated sound when sound waves bounce off other objects called?
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What was the name of the first artificial satellite launched into space?
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Which parts of a flower are often brightly-colored and have many different shapes?
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Mariner IV sent the first pictures of which planet back to earth?
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Which substance will have the highest increase in temperature for the same amount of heat?
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What kind of electromagnetic radiation arises only from nuclear excitations?
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What are plants that need two years to complete its life cycle?
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