The element is a clause if there is a subject and a verb, and it is a phrase if both of these parts of speech are not present. What comes after the introductory element is always an independent clause, or complete sentence, on its own, and the introductory element gives meaning to it.
A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.
Stomach Worms--These are one of the lesser-known categories of equine internal parasites, but they're actually found through-out North America. The three species include Habronema muscae, Draschia megastoma, and Trichostrongylus axei, but Habro-nema muscae is the only one that can be considered common.