National Institutes of Health
National Library of Medicine: Rewriting the Book of Nature
Explore the work of Charles Darwin and the theory of evolution. This comprehensive resource includes information about Darwin's life in addition to the process of species evolution.
PBS
Pbs: Biogeography Polar Bears and Penguins
From the Evidence for Evolution Library at PBS, this is a short article about biogeography. The distribution of animals is one source of evidence for Darwin's descent with modification.
Estrella Mountain Community College
Online Biology Book: Development of Evolutionary Theory
Using diagrams and descriptive illustrations, this college-level biology reference book discusses the development of evolutionary theory.
Vision Learning
Visionlearning: Biology: Galapagos Finches
Interactive animation illustrates how Charles Darwin used his study of finch beaks to explain evolution. A phylogenetic tree diagram shows how the birds' color and beak shape changed over generations.
Discovery Education
Discovery Education: Plants
The Discovery Channel provides numerous lesson plans dealing with plants. Content is organized by grade level, but all lesson plans include suggestions for adaptations for older or younger audiences.