Evolution and Oxygen

Purchase: http://hilaroad.com/video/ 3 Billion years ago cyanobacteria appeared on the planet, changing the course of life on earth. Scientists call this event the Oxygen Catastrophe.
This video discusses the appearance of cyanobacteria and the effect it had on the evolution of life over the next 3 billion years.
Suitable for an introduction to evolution, endosymbiosis and the appearance of photosynthesis and oxygen. The video includes an introduction to iron strata formation and the relationship between cyanobacteria and chloroplasts.

Category:

Education

Tags:

• evolution
• cyanobacteria
• chloroplasts
• photosynthesis
• endosymbiosis
• science
• biology
• curriculum
• school
• oxygen
• catastrophe
• Darwin

[SoraRawks]

Man, if you were my science teacher, I would make an A. You make Science interesting and enjoyable. Keep it up!

[5random1]

Oxygen is quite toxic to many forms of bacteria that are still thriving today. Too much oxygen is toxic to many forms of life on earth and in the seas.

Oxygen at 21% in the atmosphere is essential for human life. At higher levels it can be "toxic" and dangerous.

Oxygen at levels much less than 21% is needed by other living organisms.

Think planetary, not just about human life.

[Ollyoxenfree1]

There is also obligate anaerobes in our digestive systems like clostridia (is that the proper plural form?), not just at the bottom of the sea. Could have focused a little bit more on Eukaryotes in general and the other development, mitochondria which were responsible for the formation of eukaryotic aerobes (oxygen breathers) an arguably more important event in evolution to oxygenated environments. Great video over all, evolution is an under-covered subject in science education.

[RespectMyHate]

how in the world did that organism develope the ability to use solar power?

[trailkeeper]

Nice video. The microbes are not actually makeing elemental/atom oxygen themselves, it's already made but part of the molecular form in H20, I guess they are simply breaking the molecule apart into hydrogen and oxygen atoms. I wonder if a plant can combine hydrogen and oxygen atoms to make its own water.

[puncheex]

@AndSingForeverToYou: Everything is toxic, in the sense that we have evolved to make the best use of the percentages of what exists, and changes to those percentages cause harm to us, one way or another. We could have evolved in a 35% O2 atmosphere, though I rather think our skin would then be fire-resistant.

[TJASZMYEN1914]

good!!

[MrWajax]

This is truly fascinating stuff! Thumbs up and favorite. Thanks for making these videos and sharing them with us!

[hector9462]

wow nice done!!!

[hector9462]

wow nice done!!!

[grabedigger]

Amazing, sugar is Sun Power. Didn't knew about this, thanks!!

[sterenborg]

god is a creator