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.
Radial symmetry. other animals (exept sponges) and other exeption have bilateral symetry. bilateral symmetrical animals have up and down side, and a front and a back leaving â¦ left and right the same. radial animals only have an up side and down side, they do not have a fornt and back side.