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.
Heteraster texanus Sea Biscuit Cretaceous age Fossil Texas Echinoderm ech01 Sea urchins (echinoids) are a sea dwelling class of echinoderm related to the starfish, brittle star, crinoid, and sea cucumber. For lots more information on sea urchins, click here. This type of echinoid is called a sea biscuit.