Welcome to Evolution 101!

Three domains

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:

  • Definition: How is evolution defined?
  • Patterns: What patterns in diversity over time are produced by evolution?
  • Mechanisms: How does evolution work?
  • Microevolution: How does evolution work on a small scale?
  • Speciation: What is a species and how do new ones evolve?
  • Macroevolution: How does evolution work on a large scale?
  • Big Issues: What are the interesting questions about evolution that are currently being investigated?
Navigation Notes

Evolution 101 is complex, so it has been divided into two levels.

Next TopicThe Basic: By using the “next” buttons at the bottom right of each page, you will follow a path through the basic level of information for each topic.

Explore Further: You will see the “Explore Further” header at the bottom of some pages:

Explore Further

The links below this header will provide you with even more detailed information about the topic.

Teach This!
You will also see the “Teach This!” header at the bottom of some pages:

Teach This!

The links below this header go straight to lesson plans relating to that page's content.

Additional Navigation
You can also navigate within Evolution 101 by using the navigation bar at the top of each page, and the links that are presented along the left side of many pages.

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