What’s the significance of a human tailbone? Allow Craig Savage to blow your mind with evidence for evolution backed by evolutionary theorist Charles Darwin.

Evolution occurs over millions of years, so how do new species emerge? Time is only one factor— the second factor is reproductive isolation.

Darwin combined truths of geology, economics, and biology to form his theory of natural selection. But did you know he wasn’t the first to consider evolution?

Now that you know what the Hardy-Weinberg principle is, learn how violations of the principle lead to genetic changes within a specific population.

Do you know how genetic variation takes place? Learn how the genetic material of an entire species changes (hint: it happens in populations, not individuals).

Natural selection explains how evolution occurs, but it can also explain why certain organisms (like sharks and crocodiles) haven’t changed in millennia.

Where and how did life on earth originate? Learn about the hypothesis of chemical evolution - in which organic compounds formed from the primordial sea.

In this lesson, learn how volcanic activity formed the distinctive reefs, beaches, and layers of sedimentary and volcanic rock of Auckland, New Zealand.

Earth's landscape is constantly shifting and changing. This lesson breaks down the basic processes of geomorphology, or the study of changing landforms.