Ozone layer and eukaryotes show up in the Proterozoic eon | Cosmology & Astronomy | Khan Academy
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Ozone layer and eukaryotes show up in the Proterozoic eon. Great oxygenation event (oxygen catastrophe). Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/history-life-earth-tutorial/v/biodiversity-flourishes-in-phanerozoic-eon?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/history-life-earth-tutorial/v/beginnings-of-life?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness! 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. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Comments
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geniallll
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Cool ! Dr. Anna's Student !!!
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"Psionic" Psionic force heading your way raynor haha
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This video is EPIC!! it gave me the exact information i had been researching for a while! Thanks! ;D
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Sal uses a PC with: - Camtasia Recorder ($200) - SmoothDraw3 (Free) - Wacom Bamboo Tablet ($80) Prior to that, he used: - ScreenVideoRecorder ($20) - Microsoft Paint (Free) Mac users: In lieu of SmoothDraw, Autodesk Sketchbook Express works (free with a Wacom)
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@chrising299 Yes he is!
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This video (like most Khan Academy ones) is fantastic. The problem is that some of the writing is not visible - it is outside of the visible viewing area.
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cant see the whole board :(
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@:42 Looks like someone's been playing a little too much Starcraft...
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This is the first time I've ever learned about this stuff, it's so interesting!!!
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So cool. I just learned about mitochondria having its own DNA in class yesterday in AP Bio.
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Psionic bacteria! :p
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great video
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