Reproduction had to have been built-in for biogenesis to succeed. There could be no "evolution" in that process for it had to succeed from the beginning, otherwise there would be no life. If evolution continued, it began from that point.
That's the simple part. The rest, I believe, is God.
I doubt we'll ever be able to solve biogenesis, because to know what precedes it would imply knowledge of death beyond simply knowing that it happens.