New species is formed when groups from the same species are geographically isolated for long periods of time.
Selective breeding of plants or animals by humans to pass specific traits on to the next generation.
Process by which organisms with traits that better enable them to adapt to their environment will tend to survive and reproduce in greater numbers, causing beneficial heritable traits to become more common in a population.
Creation of a new species.
New species is formed when groups from the same species stop mating because of something other than physical separation.