Diploblasts are simple organisms that have two primary germ layers: the ectoderm and the endoderm. These layers give rise to the outer and inner tissues of the body, respectively. Diploblasts include groups like cnidarians, which encompass jellyfish, corals, and sea anemones. They typically exhibit radial symmetry and have a basic body plan. Unlike triploblasts, which have a third layer called the mesoderm, diploblasts lack complex structures such as organs. Instead, they possess a simple body structure with specialized cells for functions like digestion and movement. Their simplicity allows them to thrive in various aquatic environments.