Q: Which element with atomic number 7 forms about 78% of the Earth's atmosphere?
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A: nitrogen

Q: "The film ""O21"" (2014) is made under the banner of what country?"
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A: pakistan

Q: In 1869, Frenchman Eugene Meyer invented a wheel for which mode of transport, and became regarded as a father of the 'high' version of the machine?
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A:
bicycle