20: Phylogenies and the History of Life Last updated Save as PDF Page ID 12586 Boundless Boundless 20.1: Organizing Life on Earth 20.1A: Phylogenetic Trees 20.1B: Limitations of Phylogenetic Trees 20.1C: The Levels of Classification 20.2: Determining Evolutionary Relationships 20.2A: Distinguishing between Similar Traits 20.2B: Building Phylogenetic Trees 20.3: Perspectives on the Phylogenetic Tree 20.3A: Limitations to the Classic Model of Phylogenetic Trees 20.3B: Horizontal Gene Transfer 20.3C: Endosymbiotic Theory and the Evolution of Eukaryotes 20.3D: Web, Network, and Ring of Life Models