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Unit B: Interactions Among Living Things

Chapter 4: Ecosystems, Communities, and Biomes

Concept

• Ecosystems, Communities, and Biomes

Reading Skill

• Lesson 1: How Do Living Things Form Communities?
• Lesson 2: What Are Biomes?
• Lesson 3: What Is a Food Web?

Chapter 5: Life in Ecosystems

Concept

• Life in Ecosystems

Reading Skill

• Lesson 1: What Are Habitats and Niches?
• Lesson 2: What Factors Affect Ecosystems?
• Lesson 3: How Can Humans Change Ecosystems?