[Q]: Mike is studying the population growth rate of countries around the world. He noticed that countries like Japan and Russia are having a demographic shift. They have a growing population of late adulthood. He recorded the late adulthood population as population A. On the other hand, many developing countries have growing population of younger people. He recorded younger population as population B. Which population would see stronger immune system, population A or population B?
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[A]: population B

[Q]: Pat has 2 acres of land next to Tim's property. Tim's land is of similar size. The clay soil on Tim's property is very alkaline, so he had to amend it with aluminum salts to make it more acidic in order to grow crops. The soil on Pat's parcel has a good structure and high infiltration capacity. Pat gets twice as much food of his land every year. Which soil is more alkaline, the one on Pat's or the one on Tim's?
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[A]: Tim's

[Q]: Two neighboring towns had different methods of growing crops. Lean town used insecticides, while Bean town did not. Lean town had high levels of air pollution. Which town had fewer inhabitants experiencing heart disease?
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[A]: Bean

[Q]: Recently a large amount of factories have been built in Illinois using fossil fuels as their main energy source. In Indiana however, many of their factories have been shut down and replaced by parks with many plants and trees. Given Illinois adds even more of these fossil fuel burning factories will the levels of carbon dioxide increase or decrease?
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[A]:
increase