Problem: Two countries used different fuels as power sources for their activities. Alsacia used fossil fuels, while Lorena devised more advanced energy storage devices, therefore relying on electricity. Which country contributed less to climate change?

A: Lorena

Problem: Two sister countries used petroleum in different ways. Norway used it to make plastics, while Sweden used it for fuel. Which country used more fuel for trucks?

A: Sweden

Problem: Mary and Beth both went to see their blood test results. The Doc told Mary she has high cholesterol and she had to change her diet and lifestyle. Beth had a normal cholesterol level. Which patient had a higher chance of having a heart attack?

A: Mary

Problem: Two old friends were both oceanographers. They were both researching the levels of marine pollution in Earth's oceans. Vic studied the Arctic Ocean, while Dan studied the Pacific Ocean. Which friend observed fewer chemicals which were polluting the ocean?

A:
Vic