Dental Specialties in US. The American Dental Association recognizes nine dental specialties in which dentists can get additional training and practice in addition to or instead of general dentistry: 1  Dental public health-Study of dental epidemiology and social health policies.
Trichinella spiralis is a parasitic worm that causes the disease Trichinosis. A whipworm is a roundworm that infects the large intestine. Whipworms are found commonly in pork and are often called pork-worms. They are also found in rats, humans, dogs and cats.
The phylum Echinodermata includes about 7,000 living species. Members of Echinodermata are often called echinoderms. They are invertebrate animals that have radial symmetry, which means they have similar structures in several directions around a central point. In most starfish, this radial symmetry is consistent in five directions.