Problem: Recently a large amount of factories have been built in Illinois using fossil fuels as their main energy source. In Indiana however, many of their factories have been shut down and replaced by parks with many plants and trees. Given Illinois adds even more of these fossil fuel burning factories will the levels of carbon dioxide increase or decrease?

A: increase

Problem: Michael and Robert are scientists who work in a nuclear reactor facility. Michael was replacing a fuel rod in the nuclear reactor when a small explosion happened, causing Michael to be exposed to high doses of radiation in a short period of time. Robert was in the adjacent room when the explosion happened, and as a result he only suffered low doses of radiation. Who is less likely to suffer skin burns?

A: Robert

Problem: 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?

A: Team one

Problem: Two groups of athletes started new training routines this year. Group A started weight lifting for three months, while Group B, did running exercises. Which group's hearts will pump less blood?

A:
Group A