Extinction - the disappearance of a species, either globally or locally, Predation - new species may predate upon other species, Genetic variation - Different alleles cause populations to have different characteristics, Natural selection - Depending on the environment, certain alleles characteristics will help the organism survive and pass on the alleles., Isolation - Two populations of the same species become separate e.g. geographically by rivers., Genetic engineering - Take a gene form one organism and put it into another. The new organism created is said to be .................... .................,

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