Evolutionary History: The Timeline of Life: Crash Course Biology #16

Humans may have been around for a long time, but life has existed for way longer. In this episode of Crash Course Biology, we’ll journey through deep time to uncover the history of life on Earth. We’ll explore the big, game-changing leaps where life diversified, changed, and just plain persisted.

Introduction: How Life Began 0:00
Macroevolution 1:15
RNA & DNA 2:43
The Timeline of Life 3:42
Stromatolites & Fossils 6:03
Dr. Meeman Chang 8:31
Drivers of Macroevolution 10:00
Review & Credits 11:56

Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
David Fanska, Andrew Woods, Tawny Whaley, Sean Saunders, DL Singfield, Ken Davidian, Stephen Akuffo, Toni Miles, Steve Segreto, Kyle & Katherine Callahan, Laurel Stevens, Burt Humburg, Aziz Y, Perry Joyce, Scott Harrison, Mark & Susan Billian, Alan Bridgeman, Breanna Bosso, Matt Curls, Jennifer Killen, Starstuff42, Jon Allen, Sarah & Nathan Catchings, team dorsey, Bernardo Garza, Trevin Beattie, Eric Koslow, Indija-ka Siriwardena, Jason Rostoker, Siobhán, Ken Penttinen, Nathan Taylor, Les Aker, William McGraw, ClareG, Rizwan Kassim, Constance Urist, Alex Hackman, Pinapples of Solidarity, Katie Dean, Stephen McCandless, Wai Jack Sin, Ian Dundore, Caleb Weeks
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Want to find Crash Course elsewhere on the internet?

[christinarose]

Evolutionary biology is my favorite topic, I love that this series is here!

[stormweaverwitch]

please tell me you're gonna be back with Crash Course: Entomology, you've been a true delight to learn from so far!

[maxravenwood]

I think I've missed a few episodes but this is always still cool to watch new. Thanks to Dr. Sammy and the PBS/Crash Course teams!

[TharaUnfurling]

Love this, very well explained and simplifies complex concepts. You answered the question with sound interweaving of biology, geology and archaeology. So thankful to you and the CrashCourse team!

[oneeyedakuma]

I'm only saddened I didn't notice this new series sooner! I love this dude!!

[scottxiong]

Nice episode! Kept my attention the whole entire time.

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Dr. Sammy, you are awesome! Thank you CrashCourse for this great video!

[Pecisk]

Whatever origin has been, I find it quite comforting that conditions and building blocks for building life is actually very common in universe. We might be "the law" not "exception" in universe.

[saumyamathur]

hey, that’s my avatar at the end there! P4A is always a good time, & as a biologist myself, it means so much that I can make an appearance here while donating to a great cause🥰 yay CC!!!!

[SnowMenAtWork]

Thank you Dr. Sammy, you're helping so many students around the world graduate

[namelesscare]

Educational videos like this also hold a mirror up to debunk religious "creator" theories about the existence of species.

[blathnaidmulleney]

Wow! What a great and educational video :)

[derheadbanger]

11:42 Evolution has no goal or plan? Crabs would say otherwise! 🦀

[kab]

The montage of costumes was such a treat; I loved it～❤❤❤

[mattkuhn]

Dr. Sammy has the best theme song transitions

[mingzizhang-yf]

Your videos are very helpful for me to prepare my exam!!! I think your animation is very good! By the way, can I ask you what software do you use to make this videos?

[cnut]

Great start. Unfortunately the shirt made me think you were wearing lederhosen, so i kept expecting you to jump on the table and polka, so i listened more than i watched. I guess thats just how my brain works.

[johndoh]

My problem with this video or course is the skipping of earth's collision with another large body, which formed a larger earth and blasted material out which eventually would become the moon. This collision is critical. Life on earth is adapted to the moon phases and you don't get there overnight. That alone is a billion or so years of evolution.

This also requires the explanation of how after a blast of two planets colliding which would superheat everything once again and evaporate almost all the water on earth, how water gets BACK to the earth.

This is about 2 minutes of discussion. It shouldn't have been skipped

[therongjr]

How irresponsible of you to say that the dinosaurs went extinct without throwing a "nonavian" in there. Down with paraphyly!

[skybluskyblueify]

That shirt is awesome! Keep up the great work.