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.
Sea urchins are Echinoderms, spiny-skinned animals related to starfish and sea cucumbers. Echinodermata is a rather small phyla of animals and is unique in that virtually all members of this group are strictly marine. They also, as a group, employ nearly every type of feeding method exhibited by animals.