One current view is that "we exist" because our universe is built/designed/screwed around with such that "we can exist".
If so, the odds are 100% certain that consciousness probably starts at the point where the little teeny tiny computer gizmos in/on Dna TURN ON.
Or at least at the moment nothing else is on the horizon.
Once you get consciousnes down at the DNA level all the supposition about evolution becomes so much dross and drek.
“If so” and “100% certainty” are nearly polar opposites in the conceptual realm.
If consciousness is at the DNA level, then why is it we can detect consciousness by detecting brain waves?