When did the Cambrian explosion occur, and how long did the "explosion" last?
It's a biological impossibility for species to evolve- there are built in protection levels that prevent it-
Can you describe what these "built in protection levels" consist of and how they work?
The cambrian explosion was basically the earliest period ever found where species 'began' en mass- before that period, you have basically nothing, and certainly no transitional species- there's plenty on the net explaining the explosion-
Sure- the protections are built in to the cells- they prevent foreign info from tainting the species info- there are several layers of these protections which ensure that species will always remain within their own kind- this is what prevents breeders from breeding cats and dogs together- or anyhting outside of it's own kind- we find htese celular protections going all the way back to the cambrian age-