Problem: Two brothers had bike repair shops in neighboring towns. Bob's was located in a hilly area, with more precipitation and full of bike trails, so he had more people coming in, while Rob's was in the valley, near the parks. Which bike shop fixed fewer bike transmissions?

A: Rob's

Problem: Bob and Andy are two microbiologists. They are studying bacteria: Bob studies nitrogen fixating bacteria, while Andy studies non-respiratory and facultative anaerobes. Which researcher learned less about acetogenesis?

A: Andy

Problem: Two groups of people followed different diets. Group A was comprised of vegans, while group B had a regular diet, with the mention they ate a lots of fatty foods and fast-food. Which group was more exposed to unhealthy weight gain?

A: group B

Problem: Two high school buddies, Dan and Bob, had very different lifestyles 30 years later. Dan made only healthy lifestyle choices, was vegan. Bob ate meat, cheese and didn't care about his health and didn't protect himself. Which man didn't lower the risk of cancer by avoiding carcinogens?

A:
Bob