Life Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.Anti-spam check. Do not fill this in! === Antiquity === {{main|Aristotle's biology}} The first classification of organisms was made by the Greek philosopher Aristotle (384β322 BC), who grouped living things as either plants or animals, based mainly on their ability to move. He distinguished animals with blood from animals without blood, which can be compared with the concepts of [[vertebrate]]s and [[invertebrate]]s respectively, and divided the blooded animals into five groups: viviparous quadrupeds ([[mammal]]s), oviparous quadrupeds (reptiles and [[amphibian]]s), birds, fishes and [[Cetacea|whales]]. The bloodless animals were divided into five groups: [[cephalopod]]s, [[crustacean]]s, insects (which included the spiders, [[scorpion]]s, and [[centipede]]s), shelled animals (such as most [[mollusc]]s and [[echinoderm]]s), and "[[zoophyte]]s" (animals that resemble plants). This theory remained dominant for more than a thousand years.<ref>{{Cite web |url=http://www.ucmp.berkeley.edu/history/aristotle.html |title=Aristotle |publisher=University of California Museum of Paleontology |access-date=15 November 2016 |url-status=dead |archive-url=https://web.archive.org/web/20161120124920/http://www.ucmp.berkeley.edu/history/aristotle.html |archive-date=20 November 2016}}</ref> Summary: Please note that all contributions to Christianpedia may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here. You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see Christianpedia:Copyrights for details). Do not submit copyrighted work without permission! Cancel Editing help (opens in new window) Discuss this page