Vestigial structures do not harm the organism. Nature selects against only harmful traits.
It allows divergence to occur
It allows populations to become genetically different.
Tissue development
Development of a coelom
Allopatric Speciation (geographic isolation) can lead to the formation of a new species because the population is split in two smaller populations by a physical barrier (river, canyon, mountain...).
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Biodiversity resulting from few ancestors.