A dentist is the health care professional who specializes in the diagnosis, prevention, and treatment of diseases and conditions of the oral cavity (including the teeth, gums and other soft and hard tissues of the mouth). Dentists, also known as 'dental surgeons', help us maintain a bright healthy smile.
The dogfish sharks are classified in the phylum Chordata Chordata, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development.
1 Nematoda â This phylum of worms includes roundworms, hookworms and threadworms. 2  Many roundworms are parasites and can cause a variety of problems for people and pets. 3  Threadworms live on the ground in damp soil, mossy areas or in decaying vegetation.4  They can also be found in freshwater and saltwater.he following are the three classifications: 1  Annelida â This group is probably the most recognized of the three worm classifications. 2  Nematoda â This phylum of worms includes roundworms, hookworms and threadworms. 3  Platyhelminthes â The worms in this group are flat or ribbon-shaped.