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Unit B: The Changing Environment

Chapter 5: Cycles in the Biosphere

Concept

• Cycles in the Biosphere

Reading Skill

• Lesson 1: How Do Oxygen and Carbon Dioxide Cycle?
• Lesson 2: How Do Nitrogen and Water Cycle?
• Lesson 3: How Does Energy Cycle in Ecosystems?

Chapter 6: Earth's Ecosystems

Concept

• Earth's Ecosystems

Reading Skill

• Lesson 1: What Are Earth's Ecosystems?
• Lesson 2: What Roles Do Species Play?
• Lesson 3: What Relationships Do Species Have?

Chapter 7: Populations

Concept

• Populations

Reading Skill

• Lesson 1: What Limits Population Growth?
• Lesson 2: What Are Biodiversity and Succession?