The mythic idea of the tree of knowledge is introduced and from that we also are given the mythic expulsion from this cradle. After all, they have been engineered to settle on earth and to commence the terraforming of the planet.

God sets him up to provide a reason for his summary expulsion that he will accept. The settlers must know that there is no return. Although we see one archetype, it is reasonable to presume a good number of settlers were produced with a good range of genetic variability.