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by natural selection, genetic drift and geographical isolation
No, speciation is not a logically necessary consequenceof natural selection. However, given that circumstances can and inevitably will lead to divergence between sub-populations of a species, speciation can be said to be a practically inevitable consequence of evolution. It's a bit like balancing a sharp pencil on its point. Theoretically it can be done. In practice, however, the pencil will fall over the second you let it go.
reproductive isolation
the formation of species
I will assume the word you are looking for is speciation. Perhaps adaptive speciation to be precise.
Separation, Adaptation, Division
Species (phylogenetically and genetically distinct animals from a common ancestor) form when barriers exist to prevent outbreeding. These are usually environmental (e.g. mountain ranges, oceans, climatic barriers) or biological (e.g. interbreeding of two species results in an infertile offspring).
by natural selection, genetic drift and geographical isolation
speciation
The development of a new species through evolution is called speciation.
reproductive, behavioral, geographic, and temporal
Adaptive change and speciation.
Genetic drift. MutationsNatural selection.Gene recombinationGene flow (immigration and emigration)
A population becomes separated by different environments and do not reproduce with one another.
A meteor strikes Earth.
how is natural selection occurring in the pollenpeepers
finding two different sex's of animals and breeding them.. and makeing sure they are compatible.