Darwin noted the geographic distribution of species, for example, the rheas (flightless birds) are found only in __________, whereas their relatives, the emus and ostriches, are found elsewhere.

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The presence of rheas only in South America and the absence of their close relatives (emus and ostriches) from this continent points towards the role of geographic isolation in driving the evolution and diversification of species. This observation supports Darwin's theory of natural selection and evolution.

Darwin Noted the Geographic Distribution of Species, for Example, the Rheas