"Every scientist" knows that, huh?
Then why can't one of them explain it....?
The "Origin of life" is slowly being understood, but that is not the premise of" where we came from".
That is understood quite well, we know we came from the process of evolution of life on Earth , over a 3.8 billion year history.
We came from the evolution of many organisms on Earth.
It IS explained meticulously in science using genetic and through the fossil record.