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:
This information will help you identify some of the common species of sharks. There are 440 different species of sharks in the world today classified into eight different orders described below with some examples of known sharks species for each group. Some of the most popular species of sharks are: One of the most unusual types of sharks our there are know as angel sharks. Many people mistake them for some other types of sea creature. It isnât uncommon for them to be thought of as large stingrays. But the simplest way to tell them apart is by looking at the location of the fins.