Dentist specialties are recognized in those areas where advanced knowledge and skills are essential to maintain or restore oral health. The list of recognized dental specialties differs from country to country.
In contrast, radially symmetrical animals like jellyfish have a topside and a downside, but no identifiable front or back. The bilateria are a major group of animals, including the majority of phyla but not sponges, cnidarians, placozoans and ctenophores. For the most part, bilateral embryos are triploblastic, having three germ layers: endoderm, mesoderm, and ectoderm.
Starfish appear radially symmetric, but they are actually classified as bilaterally symmetric organisms. That is actuall wrong...they are radially symmetrical, but they do devâ¦elop from bilaterally symmetrical larvea From PattiVan: Think of the starfish like bicycle wheel and the legs are its spokes. The spokes are placed in a radial fashion from the center leading out; so the starfish has radial symmetry.