Ozone Layer and Eukaryotes Show Up in the Proterozoic Eon

[advanup]

Doesn't it make alot more sense to assume that UV was responsible for much of atmospheric oxygen through splitting of 2H2O to O2 than cyanobacteria at the beginning or a combination of both? then after ozone layer formation it was solely cyanobacteria. thanks for the series.

[chrising299]

Hey Sal, r u a youtube partner?

[boeing747200lr]

@chrising299 Yes he is!

[LAnonHubbard]

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.

[koliber231]

cant see the whole board :(

[veryrice]

@:42

Looks like someone's been playing a little too much Starcraft...

[UndeadTheta]

@veryrice yeah i noticed that too, lol

[ryanonfire]

This is the first time I've ever learned about this stuff, it's so interesting!!!

[XxDaRkRaZiElxX]

I love you..

[cmxcmx]

Fantastic series! I knew quite a lot of this, but this is by far the best overview I've seen about the origins of life regarding the time-line and causalities.

[jonasianbuddy]

So cool. I just learned about mitochondria having its own DNA in class yesterday in AP Bio.

[vpletap]

This video should be a part of the biology playlists, since this was covered in my AP Biology curriculum.

[Melthornal]

Psionic bacteria! :p

[Gstar000001]

great video