SPECIALISTS species are more likely to evolve on islands. Specialists are species that need very unique resources to survive.
On the other hand, generalists are species that adapt to many different environmental conditions (e.g., temperature, food, etc).
Islands have specific environmental conditions (e.g., the type of food or territory), thereby organisms tend to evolve as specialists in order to adapt to such conditions.
For example, the Galapagos finches observed by Darwin are specialists because the shape and size of their beaks are adapted to the type of food present in each of the Galapagos islands.
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