If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

WATCH: The Origin of Life

How did life on Earth begin? Learn about the conditions on Earth that made life possible and the theories about how life might have started, from simple molecules to complex organisms as you embark on a fascinating journey through time and biology. Created by Big History Project.

Want to join the conversation?

Video transcript