This test is only done in combination with the initial screening test. HIV RNA tests: The HIV RNA is different than all human RNA, and tests have been developed to detect HIV RNA in a person's blood. This uses a type of test called a polymerase chain reaction (PCR).
Taxonomy refers to the official classifications of plants or animals according to accepted scientific standards and norms. As a group, sharks belong to the superorder called Selachimorpha. They are in the Chondrichthyes class (along with Chimaeras) under the subclass Elasmobranchii.This subclass is also where rays and skates fall and some sharks are thought to be very closely related to certain ray species (even more so than to other sharks, in fact). Selachimorpha is split into Galea and Squalea.The Galea group comprises:his subclass is also where rays and skates fall and some sharks are thought to be very closely related to certain ray species (even more so than to other sharks, in fact). Selachimorpha is split into Galea and Squalea. The Galea group comprises:
All animals are categorized by a seven-part classification system. What type of animal an octopus is depends on the taxonomic level being discussed. The broadest level is kingdom, followed by phylum, class, order, family, genus and species. All octopuses belong to the order Octopoda. Octopoda is part of the class Cephalopoda, meaning that octopuses are cephalopods. Cephalopoda is part of the phylum Mollusca, meaning that octopuses are also mollusks.