This document contains a lesson plan on internal structures and functions of animals. It includes objectives, success criteria, warm up questions, videos on skeletons and how the heart works, and exit tickets assessing learning on key topics like the skeleton, heart, lungs and gills. Interactive activities are embedded to help students analyze how internal structures like the skeleton, heart and lungs function to support survival in animals. The lesson compares structures like lungs in land animals and gills in fish.