UHhhh...
Because Evolutionist state so assuredly that it all started out so SIMPLE??
Define simple.
What people say does not alter reality. Humans are considered more complex simply because that's been a cultural assumption for recorded history.
But ID advocates have brought information theory into the argument, and I'm asking, from the viewpoint of information theory, define simple and complex. Tell me how you measure information. Tell me how you determine the complexity of a genome.
You don't appear to take ID seriously, and I didn't address the question to you. I'm asking those who raised this issue earlier in the thread.