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Followers of many religions see the only legimate purpose of sex is to enable the species to reproduce. If you reproduce the exact same steps, in the same order, you should acheive the same end result.
Species or individuals capable of adaptation live to reproduce. The ones incapable of adapting, do not propagate their genes.
The result is adaptation and evolution, as improved traits should increase the population of the best species over time.
Isolation prevents mating between the populations and in time different mutations will accumulate in each population so much that they will no longer be able to mate. The inability to interbreed is one of the definitions of different species.
One mechanism is an "adaptive radiation" of one or more species into enter an area. These origin species over time reproduce and produce mutations. Given sufficient time these mutations may result in new and subspecies.by generations of adaptation from one generation to the next.
Repression.
agnosia
Diabetes mellitus
Within a species or multiple species, those with variations that allow them to store water longer or live without it longer will survive more easily. Then, they will reproduce while the less water efficient of their species die out. This is natural selection.
Try agnosia !
Inability to form new memories.