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Because oceanic islands are populated from the nearest mainland, usually, and one can see the evolutionary changes to organisms directly against a new environment. This type of species radiation is common throughout the world. Species migrate to islands, are blown of course to islands, or arrive on islands in some other fashion. The allelic representation of the population may be different when they arrive on an island, a form of drift, or just the geographic isolation changes allele frequencies as new mutations with different selective pressures changes the allele frequency over time in the island population; evolution.

Google Darwin's finches.

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