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Overview: This short video introduces basic concepts in phylogenetics and provides a model to help understand lineage-splitting. This resource is available from the Peabody Museum of Natural History Author/Source: Peabody Museum of Natural History Grade level: 9-12 Time: 10 minutes Teaching tips: This video provides a brief and intriguing introduction to phylogenetics. It would make a good opener for a unit in which students learn more about evolutionary trees and work with phylogenies. Concepts: Through billions of years of evolution, life forms have continued to diversify in a branching pattern, from single-celled ancestors to the diversity of life on Earth today. Present-day species evolved from earlier species; the relatedness of organisms is the result of common ancestry. Scientists test their ideas using multiple lines of evidence. Scientists use multiple research methods (experiments, observational research, comparative research, and modeling) to collect data. Accepted scientific theories are not tenuous; they must survive rigorous testing and be supported by multiple lines of evidence to be accepted. Science is a human endeavor. Evolutionary trees (i.e., phylogenies or cladograms) are built from multiple lines of evidence. Teacher background: Classification/Phylogenetics

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