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.
There are three types of symbiosis. Mutualism is the type in which  both parties benefit. Parasitism is detrimental to the host and  beneficial to the parasite. Commensalism â¦ is a type of symbiosis in  which one party receives benefit, but the other is neither  benefited or harmed.arasitism is detrimental to the host and  beneficial to the parasite. Commensalism â¦ is a type of symbiosis in  which one party receives benefit, but the other is neither  benefited or harmed.