[Q]: Sam and Ned went on vacation, The 2 friends partied nights and spent their days on the beach. Sam started getting flu like symptoms, so he went to the doctor's office where he found out that he was infected with HIV. Ned got scared when he heard what happened, but fortunately he was OK. Which friend contracted a virus that originated in sub-Saharan Africa during the 20th century?
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[A]: Sam

[Q]: Archaeologists studied data about human settlements. One was 100,000 years old called village R, and the other one was about 9,000 years old called village N. The older settlement was located in Africa, the other one wasn't. Which village had fairly high death rates?
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[A]: village R

[Q]: Douglas is an inventor who creates a miniature engine in his backyard that he uses to power his house. In order to fuel his engine, he has to burn a large amount of fossil fuels every day. His neighbor, Elijah, on the other hand powers his house through wind turbines, and in the process doesn't burn any fossil fuels at all. Who will contribute more to climate change?
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[A]: Douglas

[Q]: Two farmers are having a conversation at a bar about how their soil is doing. Jeff takes a sip of his beer and says that he just discovered that his soil is hypoxic. Brandon is trying to get the attention of the bartender so he can order another martini. Upon hearing Jeff's remark about his soil, Brandon states that the soil on his own farm is not hypoxic. Brandon is relieved when he notices the bartender is finally walking over to them. Which person has soil with inhibited nitrification?
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[A]:
Jeff