[Q]: Two friends met after 20 years. Tom had been smoking tobacco all these years and had some health problems related to that, while Randy quit smoking 25 years ago. Which friend was exposed more to one of the main sources of chemical carcinogens?
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[A]: Tom

[Q]: Two engineering students learned about petroleum products, While Dan learned more about plastics, Jim learned about fuels. Which student learned less about fuels for trains?
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[A]: Dan

[Q]: An archipelago in the Indian ocean included two very different islands. Snake island was a reptile paradise, inhabited by many species of reptiles. Bird island had few reptiles on it, but had various birds inhabiting it. Which island was inhabited by fewer tuataras?
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[A]: Bird

[Q]: Karen studied animals in school. She started studying predators for a school presentation. She liked it. Her friend Molly liked cows, sheep and other herbivores, so she decided to do a presentation about grazers, and their role in nature. Which girl learned more about wolves?
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[A]:
Karen