The three domains of life. Once, there were two, and now there are three - Bacteria, Eukaryote and the newest one, Archaea. All living organisms are placed into one of the three categories. The oldest is bacteria, which has been around since the dawn of time. The second is Eukaryote, which has been around for about 2 billion years, and the youngest being Archaea, which has been around for longer than discovered, in 1977.
Disclaimer
About Me
