20-A2.1s 

Initiating and Planning:  Students will formulate questions about observed relationships and plan investigations of questions, ideas, problems and issues     •design an experiment to compare the carbon dioxide production of plants with that of animals (IP-NS1)(IP-NS2)(IP-NS3)(IP-NS4)     •hypothesize how alterations in the carbon cycle, resulting from the burning of fossil fuels, might affect other cycling phenomena; e.g., sulfur, iron, water (IP-NS3)[ICT C6-4.1]     •predict disruptions in the nitrogen and phosphorus cycles that are caused by human activities (IP-NS3)[ICT C6-4.1]