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Home Chapter 1 - The Science of Biology - What is Science? - Science in Context - Studying Life - Performing Biological Investigations Chapter 2 - The Chemistry of Life - The Nature of Matter - Properties of Water - Carbon Compounds - Chemical Reactions and Enzymes Chapter 3 - The Biosphere - What is Ecology? - Energy, Producers, and Consumers - Energy Flow in Ecosystems Chapter 4- Ecosystems and Communities - Niches and Community Interactions Chapter 5 - Populations - How Populations Grow - Limits to Growth - Human Population Growth