Smithsonian Institution
Smithsonian Education: From Old World to New World
Plants have migrated around the world just like people. This site explains how several African plants and food crops made their way into American life.
Smithsonian Institution
Smithsonian Education: Medical Technology
Many medicinal plants native to Africa found their way around the world and into modern medicine. Find out about five such plants at this informative site.
Other
Evidence for Evolution: How Can Evolution Be Observed?
These pages are part of a site called Evolution that accompanies a textbook by the same name. Mark Ridley is the author. In this section, he describes how artificial selection has provided many examples of evolutionary change. Examples...