The oldest strands of DNA did nothing but replicate themselves.
That's the simple answer to a massively complex subject.
I found this brilliant attempt to illuminate this complexity here:
The thing that I cant figure out is, How does one cell mutiply to a billion to make one being, Lets say a human, evrey single cell is inter conected and passing down information. Does anyone out there have a link to a simple explanation on how this works?
like does it secrete something that tells the other what to do. Does that make sense?
Ya youre probaly having the same trouble as I am. A visual tutorial is hard to find