[Q]: The students studied two ponds. Class A studied a pond filled with protozoa, while class B studied a pond with almost no protozoa. Which class observed fewer protozoa predators keep many bacterial populations under control?
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[A]: class B

[Q]: Rob is testing the properties of gas. To that end, he experimented with a cylinder of gas in three stages, stage A, stage B, and stage C. In stage A he kept the gas in room temperature. In stage B he heated the gas up. And in stage C he cooled the gas down. Which stage would see increased pressure, stage B or stage C?
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[A]: stage B

[Q]: Mark and Ken were taking a lunch break. Mark bought some fast-food from a major chain, while Ken ate an egg salad and pork he got from his aunt. Mark got norovirus and hepatitis A virus. Ken got sick because he got infected with Giardia and trichinella. Which person won't be treated with diet changes?
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[A]: Ken

[Q]: Two students studied animal behavior for the biology class. Ned studied more about predators, while Kim studied more about herbivores. Which student learned more about rabbits?
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[A]:
Kim