Problem: Which gas in the atmosphere can be turned into fertilizer by some microbes?
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A: nitrogen

Problem: May 15, 1928 saw the introduction of what iconic character, when the 6 minute short Plane Crazy was publicly introduced, co starring Clarabelle Cow?
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A: mickey mouse

Problem: Pharology is the study of what?
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A: lighthouses and signal lights

Problem: Avianca is the national airline of which country
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A:
colombia