20.1: Introduction
- Page ID
- 103715
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Chapter Outline
20.2 Organizing Life on Earth
20.3 Determining Evolutionary Relationships
20.4 Perspectives on the Phylogenetic Tree
This bee and Echinacea flower (Figure 20.1) could not look more different, yet they are related, as are all living organisms on Earth. By following pathways of similarities and changes—both visible and genetic—scientists seek to map the evolutionary past of how life developed from single-celled organisms to the tremendous collection of creatures that have germinated, crawled, floated, swum, flown, and walked on this planet.