1. How Ecosystems Work Unit 3 Use this Powerpoint to guide your research. Address all RED questions/statements in your WIKI

2. Energy Flow in Ecosystems Roles of producers and consumers Energy flows from the sun to producers to consumers – Food webs Energy pyramid = trophic levels Could there be life on earth without producers?

3. The Cycling of Materials Water, Carbon and Nitrogen Describe the role of producers in the carbon cycle How are humans altering the carbon cycle?

4. How Ecosystems Change Primary and Secondary Succession Explain the Importance of Pioneer Species - Explain why it may be damaging in the long run to put out some forest fires