Begin the lesson by introducing the concept of animal structures and their importance in survival. Discuss how these structures can be external or internal and relate to the animal's environment and behavior.

Explain the difference between external and internal structures of animals, providing examples such as feathers in birds and skeletons in sharks.

Discuss how these structures help animals adapt to their environments and enhance survival.

Watch the video 'Animal Structures for Movement' to understand how different animals have adapted their structures for efficient movement.

Engage students in a discussion about how these adaptations help animals survive in their specific habitats.

Conduct a classification activity where students sort images of animals based on their external structures and discuss their functions.

Use the 'Design and Build an Exoskeleton' assessment to explore the concept of exoskeletons by designing a model that solves a human problem.

Assign students to research an animal of their choice and identify its key external and internal structures, explaining their functions.

Use the 'External Structures for Movement' assessment to evaluate students' understanding of how external structures aid in animal movement.

Facilitate a class discussion to review the key concepts learned about animal structures and their functions.

Encourage students to reflect on how these structures are adapted to the animals' habitats and lifestyles.

Administer the 'External and Internal Animal Structures' assessment to assess students' understanding of animal anatomy and survival.

Encourage students to take the quiz to test their comprehension of the unit.