[Q]: Two neighboring habitable planets from the same solar system, planet U and planet N, had Earth-like atmospheres. The inhabitants of planet U destroyed the ozone layer by their actions, while their neighboring planet N didn't. Which planet produced less air pollution?
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[A]: planet N

[Q]: Two animal collectors met online to talk about trading animals. Greg was a reptile collector and owned most reptile species. Danny collected rare birds but was thinking about buying some reptiles. Which person owned more snakes?
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[A]: Greg

[Q]: Students learned about protozoa in school this week. Dan and Jim were interested and read more on the subject. Dan read more about predatory and parasitic protozoa, while Jim read more about herbivore and decomposer protozoa. Which student read more about protozoa that live on living hosts?
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[A]: Jim

[Q]: Ben and Mike both studied earthquakes, while Mike was more interested specifically in mantle melting and related phenomena. Which person learned that the subducting plate increases as it sinks into the hot mantle?
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[A]:
Mike