[Q]: Two researches studied living organisms, Joe studied eukaryotes, while Bill studied prokaryotes. They were fascinated by genetic variation. Which researcher observed fewer membranes of two cells merging?
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[A]: Joe

[Q]: Tim and Jeb were both studying chemical engineering. At a certain point in time, Jeb started studying chemicals that are not harmful for the environment, while Tim started learning about chemicals that were once used, but now are known to be harmful for the environment. Which student studied more about what causes brain damage in children?
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[A]: Tim

[Q]: Mike is a doctor with a local hospital. Today, he is seeing two patients, patient A and patient B. Patient A is in early adulthood, but patient B is in late adulthood. Mike needs to find the differences between the patients to come up with recommendations for them. Which patient is less at risk for Alzheimer's disease, patient A or patient B?
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[A]: patient A

[Q]: Barbara and Jane are two students. They both like meteorology. Barbara studies the formation of the ozone layer, while Jane studies about the stratosphere. Which student learned more about vertical mixing?
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[A]:
Jane