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1. 2 groups of similar birds2. Some individuals move between populations through random migration causing gene flow3. Natural disaster occurs, barring migration and gene flow. 4. Natural selection and sexual selection continues in the 2 populations, creating new traits in both populations5. If now reintroduced, females from one group will most likely not reproduce with the other group 6. Genetic drift and mutation continue to accumulate genetic differences between the 2 groups and eventually creates a new species
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