Evolution of Animal Shapes
In Chapter 23, you learned that different animals that share a common ancestor have homologous structures, for example, bones in the appendages (leg, arm, wing and flipper of Figure 23-5). In the figure in your textbook, the homologous bones have the same
Visit the Visualize Change web site
|
Origins of Humans
In Chapter 23, you learned about evolutionary schemes showing how the human species may have evolved, and you read about Lucy, the oldest known australopithecine skeleton fossil. Figures 23-10 and 23-12 in your textbook illustrate the debate among scienti
Visit the WGBH Evolution web site
|
