Charles Darwin observed multiple species of finch on the Galápagos islands. He proposed they adapted over time to different habitats of the islands. This is an example of the ______ model of speciation.

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The gradualistic model of speciation, also known as phyletic gradualism, suggests that species evolve through a gradual process of small genetic changes. Darwin's observation of finches adapting over time to different habitats on the Galápagos Islands is a classic example of this model, where small, incremental changes lead to speciation.

Charles Darwin Observed Multiple Species of Finch on the Galápagos