Explore the fascinating evolution of large, complex multicellular animals in this 28-minute video. Delve into the role of oxygen respiration in enabling the development of huge organisms during the Ediacaran and Cambrian periods. Learn about redox reactions, the redox tower, and how redox stratification impacts both life and geology. Discover the connection between metabolic energy yields and the emergence of complex life forms. Follow the journey from early Earth's redox zones to modern sediment layers, understanding how these changes facilitated the growth of tiny organisms into massive creatures. Gain insights into fundamental concepts of biology, chemistry, and Earth science, presented in an engaging and accessible manner for viewers of all backgrounds.