The stability of the kingdoms might have caused the split due to changes in the environment...after all...there are less humans than spiders and insects...
Mutation is a specific sequence change...
Genetic split is when the two kingdoms separate in similarities and become independent species...
We all had a common ancestor...just the environment's constant changes caused the ancestors to change and split up...


there have been many attempts in last 20years to make this available weirdly all of the people who invent them suddenly die or disappear... honest it's just pure coincidence they all do... eak lol