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PROCESS THAT LEADS TO SPECIATION, Prevent mating between individuals, …

- - - - Different species reproduce at different times
    - - Different species live in different habitats within same geographical area
    - - Different animal species have different courtship patterns
    - - Different animal species have different genital structures
        OR
        Different plant species have different floral structures
    - - Fertiliztion cannot occur between gametes from different species
  - - - Hybrid not viable (not fully developed) or died (not survive long enough to reproduce)
    - - Hybrid develop into sterile adult
    - - Produce viable and fertile hybrid in F1 generation but next generation in sterile