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.
Parasites include multicelled and single-celled animals, fungi, and bacteria, and some authorities also include viruses.Those that feed upon human hosts can cause diseases ranging from the mildly annoying to the severe or even fatal. (See accompanying table.). Types of parasites. 2. parasitic fetus.accidental parasite one that parasitizes an organism other than the usual host. facultative parasite one that may be parasitic upon another organism but can exist independently. incidental parasite accidental parasite. malarial parasite Plasmodium.obligate parasite (obligatory parasite) one that is entirely dependent upon a host for its survival.arasites include multicelled and single-celled animals, fungi, and bacteria, and some authorities also include viruses.Those that feed upon human hosts can cause diseases ranging from the mildly annoying to the severe or even fatal. (See accompanying table.). Types of parasites. 2. parasitic fetus.