by natural selection, genetic drift and geographical isolation
Specation can be used in many ways.
Adaptive Radiation
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
Separation, Adaptation, Division
speciation
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).
The development of a new species through evolution is called speciation.
reproductive, behavioral, geographic, and temporal
Specation can be used in many ways.
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
Adaptive Radiation