Usain was once a competitive swimmer, but he became bored with the sport and decided to start running very frequently instead. Usain tried to convince his brother, Asafa, to take up running as well. Asafa didn't really like running, though, so he hardly ran much at all. Who will increase the strength of their cardiac muscles more?
Ans: Usain

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 more people that experienced fatigue?
Ans: Team X

Doctor Jones studied two teams of workers. Team one had healthy people with normal red blood cell levels, but team two had people with sickle-cell anemia. the differences in health parameters were amazing and obvious. Which team didn't have people with crescent shaped cells in their blood?
Ans: Team one

David is experimenting with electromagnetic waves. He has four different waves to study, wave A, wave B, wave C, and wave D. In wave A, distance between two corresponding points on adjacent waves is greater than that of wave B. In wave C, the number of waves that pass a fixed point in a given time is greater than that of wave D. Would wave B have less or more energy than wave A?
Ans: more