The document summarizes the evolution of classification systems for living organisms from early systems proposed by Linnaeus and Haeckel to more modern systems proposed by Whittaker and Woese. It describes Whittaker's five kingdom system which divided organisms into Monera, Protista, Fungi, Plantae, and Animalia. It then discusses how Woese proposed splitting Kingdom Monera into the domains of Archaea and Eubacteria based on genetic studies, establishing the current three domain system of Archaea, Bacteria, and Eukarya.