All life on Earth can be divided into two essentially different life forms—eukaryotes and prokaryotes. The eukaryotes gather their genetic material in a nucleus, while the prokaryotes (bacteria and archaea) have their genetic material floating freely in the cell. Eukaryotic organisms—such as humans—can, as a result of the new findings, be divided into the following four categories:• Plants (green and red algae, and plants)
• Opisthokonts (amoebas, fungi, and all animals—including humans)
• Excavates (free-living organisms and parasites)
• SAR (the new main group, an abbreviation of Stramenophiles, Alveolates, and Rhizaria, the names of some of its members)
http://www.apollon.uio.no/vis/art/2007_4/Artikler/The_Tree_of_Life
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