From Citizendium, the Citizens' Compendium
Jump to: navigation, search
This article is a stub and thus not approved.
Main Article
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
This editable Main Article is under development and not meant to be cited; by editing it you can help to improve it towards a future approved, citable version. These unapproved articles are subject to a disclaimer.

Biologists group organisms into a hierarchical system of taxons or taxonomic units, each taxon based on specified criteria of similarity or relationship.

The figure at the right illustrates the hierarchy of taxons. The highest taxon, the 'domain', of which biologists have identified three — Archaea, Bacteria, and Eukarya — together include all known living systems.