Explanation:
Contamination can have undesirable consequences in real experiments, some of them are related to the feelings that may arise in the research participants, the contamination bias reduces the differences between the research groups, and can cause a comparison between the treatments of each different group, the which can generate conflicts and rivalries on the part of groups that consider themselves to be inferior to others. These contamination-related problems can significantly interfere with the research results.
C. Capitalism through free enterprise.
However in reality we in USA have a “mixed” economy. Government intervention to provide safety measures, subsidies etc.
George Washington Carver was a scientist and botanist who sought to solve the agricultural problems of the American south. As a result of the single-crop system in use where most farmers planted only tobacco or cotton, the soil had been depleted of the necessary nutrients. Carver discovered that if new crops, rich in nitrogen and proteins, were planted the soil would recover.
He petitioned the Southern farmers to plant soybeans, sweet potatoes, and peanuts. These crops grew well and solved the problem of the soil, however, there was no market for their sale. Carver tried to solve this problem by establishing a market for these goods by finding new uses for the plants, specifically peanuts, and sweet potatoes.
