Chapter 19 – Population and Community Ecology

• Section 19.1 – Population Demographics and Dynamics
• Section 19.2 – Population Growth and Reproduction
• Section 19.3 – The Human Population
• Section 19.4 – Community Ecology

Chapter 20 – Ecosystems and the Biosphere

• Section 20.1 – Energy Flow through Ecosystems
• Section 20.2 – Biogeochemical Cycles
• Section 20.3 – Terrestrial Biomes
• Section 20.4 – Aquatic and Marine Biomes

Chapter 21 – Conservation and Biodiversity

• Section 21.1 – Importance of Biodiversity
• Section 21.2 – Threats to Biodiversity
• Section 21.3 – Preserving Biodiversity