It is a one-time invention that has been repeated in an infinite number of forms since life existed on Earth.
Life, so the consequence from this consideration, cannot be explained from its origin, but only from its continuation.
One can speculate about the processes that preceded the emergence of life from the primordial soup, but the crucial point is not its emergence but its Reproduction. Life is its own ("autos") work ("poiesis"). ⇒ Autopoiesis
[…] one must stop planning Children and start designing them.