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    How does a new species arise and what are the four main stages?
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    Speciation is the term used when a new species is created:
    1) Isolation - a barrier eg. Mountain splits one population of a species into two populations.
    2) mutation - different mutations occur in each population
    3) selection - due to different selection pressures in the populations, different mutations are advantageous and passed to offspring.
    4) time - after time has passed, mutations have been passed on to the next generations and the two populations have evolved into two different species - they can no longer breed to produce fertile offspring.

    Hope this helps
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