Return to Unit List Grade 4   Unit B: Animals as Living Things     Chapter 3: Describing Animals   Lesson 1: Animal Characteristics   Summary   Quiz   Lesson 2: Animals Without Backbones   Summary   Quiz   Lesson 3: Animals with Backbones   National Geographic: Spider Giants   Summary   Quiz   Research Report: Animals   Chapter 3: Links Chapter 4: Life Processes   Lesson 4: Organ Systems   Summary   Quiz   Lesson 5: Development and Reproduction   Summary   Quiz   Lesson 6: Animal Survival   National Geographic: Dancing Bees   Summary   Quiz   Research Report: Animal Adaptation   Chapter 4: Links   People in Science/Careers