Problem: There are two lakes in southern Indiana that are popular places for families of nearby cities to visit for picnics and parties. Lake Mahoe is right next to a large farm that grows all kinds of crops for the town. The owner of the farm also rents out his barn regularly so people can use it for celebrations. Lake Tresco is located near a school and children will often come play at it during recess. Does lake Mahoe have more or less chemicals in it than lake Tresco?

A: more

Problem: Daniel visited two countries. Switzerland and India. There was almost no air pollution at all in Switzerland, while the air in India was almost impossible to breathe it was so polluted. Which country had fewer people develop lung cancer?

A: Switzerland

Problem: People in the coastal area naturally get more iodide from food items because the soil has more iodized salt. But farther we go inland, the soil lacks necessary iodine. As a result, inland population do not get enough iodine naturally. Where people are less at risk of mental retardation, coastal area or inland?

A: coastal area

Problem: Two twin brothers had very different blood pressures. Tom had very high blood pressure, while Dan had low blood pressure. Which brother does not have to make any diet changes?

A:
Dan