Starfish (sea star) is an animal does not have a spine. Solid surface layer structure is not bonding with your muscles. Starfish is a mobile system with water (water vascularsystem).
Star of the Sea (sea star) are invertebrates. A rigid frame that does not adhere to the surface of the muscle. Sea stars are moving with water (water vascularsystem) contain.
Star of the sea (sea star) are invertebrates Structure, solid surface not adhesion to the muscles. Sea water piping system movement with (water vascularsystem) consists of