In this chapter, students gain a basic understanding of animals’ key external body parts and how different animals use them to survive or to make their lives easier. It explores specific ways animals use their external body parts to find and catch food, and investigates how animals use their body parts to protect themselves from predators. The chapter looks at the structure and function of plant parts. It focuses on the engineering practice by encouraging students to design a solution to a human problem using what they have learned about plants and animals. Students learn that animals have body parts that help them live and grow. They also discover that different animals may use a particular body part in different ways. Students begin to wonder how other kinds of animals use their body parts to survive.