Basics of Biology

Classification of Life

What is the latest (to date) way to classify organisms?

One of the latest classification systems is based on DNA analysis—a much more accurate way to reflect the evolutionary history and interconnections between organisms. This is the three-domain system, which includes Bacteria, Archaea, and Eukarya. The domains Bacteria (Eubacteria or “true” bacteria) and Archae (Archaebacteria or “ancient” bacteria) consist of unicellular organisms with prokaryotic cells. The domain Eukarya consists of four kingdoms: Protista, Fungi, Plantae, and Animalia; organisms in these groups have eukaryotic cells (for more about eukaryotic and prokaryotic cells, see the chapter “Cellular Basics”).


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