The code that is DNA

[Peebothuhlu]

Hello, I'm not sure I understand why my sense of scale is off on account of such findings being within the same biology.

I'm also not sure I understand why DNA would make RNA go extinct back then, when DNA is currently transcribed to RNA in our cells, and here are still microorganisms in existence with either RNA or DNA genomes.

So.

Life has been on the planet for an estimated (Outside edge) 4 and a half BILLION years.

That is a 'Long' time. In that time the surface of the planet has, litterally, reshaped itself through continental plate tectonics.

So, pretty much every place on the planet has been every where else.

So, once really basic bio chemistry got started and spread.... It's been spread every where simply due to tectonic plate movements over such a long time. There are no 'Pristine pockets' any more. Everything has been smeared around.

You don't see South American 'Terror birds' any more because land connections changed and new, better competing species arrived and simply, effectivly, 'Ate' them into extinction.

The only reason we have a plethora of marsupials to marvel at is because that continent has remaned geographicaly isolated for such an amount of time.

But, at a fundamental level, everything today is still the same, basic DNA copying around.

The 'RNA world' hypothesis is that, innitally, there was no DNA.

ONLY RNA. a form of RNA did everything/was everything. All the cells (Or what have you) were nothing BUT RNA scrolling about doing its thing. RNA was making the bits that were making the bits that were forming the early 'Cells' etc.

Then... DNA got put together. It was better/quicker/*Insert proper technical term here* at making more DNA and so it simply took over.

Potentially 'Eating' the RNA competitors around it untill all that was left were competing DNA type things.

Now, if you look about, do you see anything to indicate a 'Pocket' of that lost RNA world? No, you don't.

RNA is only found as a.... sub set... of the greater DNA biology of today.

Cheers.

Not at work.