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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/ap-biology/natural-selection/origins-of-life-on-earth/v/origins-of-life

An overview of the question of how life first arose on Earth.

Watch the next lesson: https://www.khanacademy.org/science/biology/history-of-life-on-earth/the-diversification-of-life/v/ozone-layer-and-eukaryotes-show-up-in-the-proterozoic-eon

Missed the previous lesson? Watch here: https://www.khanacademy.org/science/biology/history-of-life-on-earth/history-life-on-earth/v/beginnings-of-life

Biology on Khan Academy: Biology, defined as the scientific study of life, is an incredibly broad and diverse field. In many ways, it's as kaleidoscopic and rich as living organisms themselves. Biologists study life at many scales, from cells to organisms to entire ecosystems. Begin your own biological journey here!

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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