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A Carolina Exclusive! Grades 9-12. Students explore the need for laws to protect our environment and standard of living. The importance of the Clean Air and Clean Water Acts are emphasized, along with the concept of the Tragedy of the Commons. They perform an LD50 (lethal dose, 50%) experiment of a water pollutant on a population of brine shrimp and study the effects of nitrogen dioxide on plants. Part of the Inquiries in Science® series.