Doctors studied two groups of individuals: group O with people over 65, and group S with people under 65 years old. They published the results in a magazine. Which group had fewer people that have free time for grandchildren?
Ans: group S

Doctors studied Dan, a normal patient, whit a normal number of red blood cells, and Jim, a patient that had sickle-cell anemia. The differences were remarkable in terms of overall well-being and health. Which patient had more normal shaped red blood cells, Dan or Jim?
Ans: Dan

Two teams of runners were training for a 10k. Team Y jogged early in the morning when the weather was cool. Team X started their training in the heat so many team members had problems sweating. Which team had fewer people that experienced muscle weakness?
Ans: Team Y

David is a biologist. He was in the African savanna to study different species. Especially, he was interested in two species, rhinos and impalas. He noticed that in response to constant human encroachment of wildlife habitats, impalas have acquired some behaviors that help them and their young. Rhinos also have acquired some behaviors in response to the same threat. But their behaviors mostly failed them in that aspect. In which species the behaviors in question would be more common, rhino or impala?
Ans: impala