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Unit A: Organization of Living Things

Chapter 1: Life Processes

Concept

• Life Processes

Reading Skill

• Lesson 1: How Are Living Things Organized?
• Lesson 2: How Do Plants Carry Out Life Processes?

Chapter 2: Human Body Systems

Concept

• Human Body Systems

Reading Skill

• Lesson 1: What Is the Digestive System?
• Lesson 2: What Are the Circulatory and Respiratory Systems?
• Lesson 3: What Are the Skeletal and Muscular Systems?

Chapter 3: Life Cycles

Concept

• Life Cycles

Reading Skill

• Lesson 1: How Do Plant Life Cycles Vary?
• Lesson 2: How Do Animal Life Cycles Vary?
• Lesson 3: How Are Offspring Like Their Parents?

Chapter 4: Responses of Living Things

Concept

• Responses of Living Things

Reading Skill

• Lesson 1: How Do Living Things Detect Stimuli?
• Lesson 2: What Are Inherited and Learned Behaviors?