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Bio07_TR__U02_CH4.QXD 5/3/06 2:36 PM Page 75 Name______________________________ Class __________________ Chapter 4 Ecosystems and Communities Date ______________ Section Review 4-4 Completion On the lines provided, complete the following sentences. 1. The four main factors that affect aquatic ecosystems are , , , and . 2. Most freshwater ecosystems belong in one of two following categories: ecosystems and ecosystems. 3. The ocean zones based on light penetration are the and . 4. The ocean zones based on the distance from land and the depth of the ocean floor are the , , and . Reviewing Key Skills 5. Applying Concepts What abiotic factors characterize salt marshes? 6. Applying Concepts Why might a wide range of species be endangered by the pollution of an estuary? 7. Applying Concepts What role does phytoplankton play in the food webs of many aquatic ecosystems? 8. Comparing and Contrasting What distinguishes the photic zone from the aphotic zone in a marine ecosystem? 9. Comparing and Contrasting Explain why photosynthesis is more likely to occur throughout the coastal ocean but only in a small part of the open ocean. 10. Predicting Which ocean zone would seem least likely to support marine life? © Pearson Education, Inc., publishing as Pearson Prentice Hall. 75