Evolution and Oxygen

[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.

[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

[Mochokidae]

Agreed, this video was good!

[gagaplex]

Amazing video; we always hear about the evolution of animals but rarely about plants.

[mystisme]

loooooooove this wich theire were more of these

[xtruder02]

biology rulz

[Oz6102]

Oxygen My favorite Element. I know it is reactive but toxic?

Its compounds can be toxic but Oxygen itself is not toxic.

[JordanMedina]

But then again you aren't a single celled, anaerobic ocean dweller. It's not toxic to us because of our adapted biochemistry.

[MattBlytheTheOne]

Not now! All living things require oxygen... because "living" is an interactive relationship.

[darksideofthebrick13]

yes, but not too much. Breathing in pure oxygen can kill you.

[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.

[hornetpalooza]

Maybe oxygen was poison to the other lifeforms?

[JordanMaster22]

It was toxic to water breathers? We have evolved to use oxygen in a beneficial way. In fact, When you breathe air, you're only breathing about 21% oxygen, the rest is nitrogen. Breathing pure O2 can kill you.

[Warsel]

If you go by "toxicity - Degree to which a substance may harm a cell or organism"

then, yes, oxygen is toxic. Heck, it's even a defense mechanism that you own immune cells use to kill bacteria (respiratory burst).

[AndSingForeverToYou]

CO is toxic. To some organisms Oxygen would be toxic. If we could somehow get too much oxygen into our system it would be toxic for us. However, we have evolved such that is not really a possibility. But those oxygen bars are a bit of a worry...

[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.

[sciencoking]

in usual concentrations, it´s not toxic. But pure oxygen slowly damages your lungs...

[SoraRawks]

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

[wcdeich4]

For older people, "cyanobacteria" = blue-green algae. The name was changed b/c they're not eukaryotic algae, but prokaryots like bacteria.

[Nw949wN]

Besides having the anti-oxygen cells hiding under the ocean, what happened to those, have we been able to examine them? What are those anti-oxygen cells/bacteria?

[RRS4ever2]

The cells that die when exposed to oxygen are called obligate anaerobes. There are two other classes of anaerobes that can tolerate low oxygen levels but are much happier without it.

Clostridium is a genus of obligate anaerobes that contains many different species including ones that cause human diseases. Clostridium botulinum causes botulism due to a toxin the bacteria releases, which is also the active chemical in the cosmetic treatment Botox.

[cool70200]

Very nice and informative.

Why arent you more popular?

[musa0217]

cool

[DarkHawkShadow]

cyanobacteria aren't actual bacteria they are part of the archea family

[undernewchurch]

thx and greez from germany

[heven729]

outstanding video like always! 5/5

[ErichoTTA]

That sounded like Michael Moore.

[sioplar]

thanks for the video

[prayfertrey]

Learning requires spending your childhood being told what to think and when to think it?

[Lity10]

Partly. Rote learning is the key to failure, though.

[prayfertrey]

Partly? Why do you think that?

[Bugglesfan79]

Interesting and informative as always :) 5/5

[yomaster29]

This is great. I have my doubts they will teach us this in school.

[Pazma1]

Very interesting.

[ericpid]

amazing. thank you

[hamsteralliance]

I don't recall them teaching me this in school, so thanks for the information. :)

[LinuxUser269]

As always  informative and interesting

[wwscsoccer5]

koolio

[zeropointprophet]

wow!! good for you

[joeymackaroni]

Very informative. Thank you!

[masterhook]

wow, I love this stuff. learn new stuff all the time when you open your mind to the real world aound us

[notscooter952]

Beautiful stuff. I wonder if after billions of years the pond-dwelling cyanobacteria has changed much? And another thing, I'd be curious to know if the chemical reaction shown occurs in nature without being synthesized by plants.

[rsuthe00]

Wonderful video. Thanx for posting.