After seeing this image:
And reading this:
"The long wavelength limit is the size of the universe itself, while it is thought that the short wavelength limit is in the vicinity of the Planck length, although in principle the spectrum is infinite and continuous."
The question is, how did the EMS evolve? Was it weak at first, i.e. at Planck time, which allowed certain reactions to modify, shape or add properties to it?
What really defined the position and order of everything that is the EMS? E.g. colors. What defined or added something as colors to be inserted in that specific range of 400nm to 700nm.
Hope this is not to philosophical and thanks in advance.