[Q]: Two rivers, The Minninnippi and The Cedar, flow into the same ocean. The Minninnippi is surrounded almost entirely by farm lands due its location in a flat area of the country that sees regular rainfall. The majority of these farms will have runoff from their crop soil flow into the river. The Cedar is located mostly inside an unpopulated forest. Currently, not much industrialization or settling by humans has happened near The Cedar. Will the ocean water near The Minninnippi or The Cedar have more oxygen?
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[A]: The Cedar

[Q]: Two friends had different lifestyles. Tom adopted a healthy lifestyle choice to prevent cancer, but Bill didn't. Bill was diagnosed with cancer a year later. Which of the two friends avoided carcinogens?
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[A]: Tom

[Q]: Indiana has decided it wants to do its best to stop contributing to global warming. The first place the government decides to look is at the number of factories that use fossil fuels in production. They plan to shut down many of them in the coming years. Given one of the factories in Indiana is right next to a body of water, will the levels of carbonic acid in the water be higher or lower than a body of water with no factory near it?
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[A]: lower

[Q]: Two medical school students named Dan and Bob learned about the human immune system. Dan studied more about the subject, and became very interested to pursue it more in the future. Which student didn't learn that the infected skin area may become painful?
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[A]:
Bob