Two ecologists, Robert H. MacArthur and Edward Wilson, studied how organisms immigrate to islands and how their numbers change after colonization. They developed the island biogeography model to explain the composition and diversity of island species. The graph below shows the number of species versus the size of the Caribbean island: Number of Species 1,000 100 10 1 Redona SPECIES BY AREA Saba Puerto Rico: Monserrat 1,000 Hispaniola Jamaica 10.000 Cuba 100,000 1,000,000

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