How does a shapeless, jelly-like substance develop into a living animal with a backbone, heart, and brain? This lesson provides the wonderous answer. These eight slides offer a window into the world inside the egg, allowing students to observe the development of a chicken embryo from 13 hours to 96 hours. 1. Chick embryo at 13 hours - wm/st 2. Chick embryo at 18 hours - wm/st 3. Chick embryo at 21 hours - wm/st 4. Chick embryo at 28 hours - wm/st 5. Chick embryo at 38 hours - wm/st 6. Chick embryo at 48 hours - wm/st 7. Chick embryo at 56 hours - wm/st 8. Chick embryo at 96 hours - wm/st