Echinoderms are a group of marine animals known for their unique radial symmetry and hard, spiny skin. This phylum includes well-known species such as starfish, sea urchins, and sea cucumbers. Echinoderms typically have a water vascular system that helps them move and feed, using tube feet to interact with their environment. These creatures are found in various ocean habitats, from shallow waters to deep sea environments. Echinoderms play important roles in marine ecosystems, contributing to the balance of their habitats. They also exhibit remarkable regenerative abilities, allowing them to regrow lost limbs or body parts.