What is evolution and how does it work? Evolution 101 provides the nuts-and-bolts on the patterns and mechanisms of evolution. You can explore the following sections:

• An introduction to evolution
  Evolution briefly defined and explained
• The history of life: looking at the patterns
  How does evolution lead to the tree of life?
• Mechanisms: the processes of evolution
  How does evolution work?
• Microevolution
  How does evolution work on a small scale?
• Speciation
  What are species anyway, and how do new ones evolve?
• Macroevolution
  How does evolution work on a grand scale?
• The big issues
  What are some of the big questions that evolutionary biologists are trying to answer?