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	122 Directed Inquiry Explore How can you find out how many animals live in an area? 124 How to Read Science Predict 125    You Are There! 126    Lesson 1 What is an ecosystem? 127    Lesson 2 What are land biomes? 130    Lesson 3 What are water ecosystems? 136    Lesson 4 How do organisms interact? 140    Lesson 5 How does energy move in ecosystems? 144    Lesson 6 What cycles occur in ecosystems? 148 Guided Inquiry Investigate How can you show that plants use carbon dioxide? 154    Population Cycles 156   Chapter 5 Review and Test Prep 158    Greenhouse Manager 160