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	162   Directed Inquiry Explore How can pollution affect a habitat? 164   How to Read Science Cause and Effect 165     You Are There! 166      Lesson 1 How do ecosystems change? 167      Lesson 2 How do species change? 170      Lesson 3 How do changes cause more changes? 174   Guided Inquiry Investigate What happens when a wetland ecosystem changes? 178      Recovery Plans for Species 180     Chapter 6 Review and Test Prep 182      Patricia Larenas 184     Unit A Test Talk 185      Unit A Wrap-Up 186   Full Inquiry Experiment How does salt affect the hatching of brine shrimp? 188   Science Fair Projects How Can You Estimate a Cell’s Size?; What Can Live in a Drop of Water?; Identifying Organisms Around You 192      FCAT Test Prep afcat 1