While on the beagle, darwin's observations suggested that geographic proximitys (are) a better predictor of relationships among organisms than similarity of environment.
Darwin spent most of his time on land during the Beagle's five-year trip, gathering thousands of samples of fossils and living plants and animals. Many of Darwin's discoveries suggested that geographic proximity rather than environmental similarity is a better predictor of relationships between organisms.
For instance, the South American fossils Darwin discovered were also uniquely South American in that they resembled the living plants and animals of that continent, although clearly belonging to a different species from the ones that are alive today.
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