Science

Earthmen first sent a spacecraft to which planet?

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Which of these particles was discovered first?
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At what temperature fahrenheit does water freeze?
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What does a ruler measure?
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What cells store food in the roots?
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The word "lunar" means something related to what?
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Which of these is a cause of water pollution?
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Which star is the brightest star in the northern sky at night?
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Which of the following is a type of cloud?
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