How do coelenterates eliminate waste?

Coelenterates, such as jellyfish and corals, eliminate waste through a process called diffusion, as they possess a simple body structure with a gastrovascular cavity. This cavity serves both for digestion and waste removal, allowing undigested food and metabolic waste to exit the body through the same opening used for ingestion. Since they lack specialized excretory organs, waste products diffuse directly into the surrounding water. This efficient method is suitable for their aquatic environment, where waste can be easily dispersed.