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Introduction to Organisms

Author(s): Deanne Erdmann, MS

Introduction to Phylogenic Kingdoms

In the presentation, "Introduction to Biological Classification," we introduced classifying organisms under a broad three-domain system versus classifying organisms using a five, six, or more kingdom approach. For the purpose of this discussion, we will refer to the traditional five-kingdom system. 

Organisms are divided into each of five kingdoms based on defining characteristics, such as: cell type; cell structures; whether the organism is unicellular, multicellular, or has both forms; and nutrition. As new information is gathered, classifying approaches are constantly being refined.