EVOLUTION
MODERN THEORY OF EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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were identical to 13 finch species in northwestern South America 600 miles to the east
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probably evolved from one ancestral South American species
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had all adapted to the same food sources
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all of the above
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Detailed explanation-1: -Eventually Darwin theorized that different species of finch had evolved on different islands, their distinctive beaks being an adaptation to distinct natural habitats or environmental niches. The woodpecker finch is one of the only birds to use tools to help him find food.
Detailed explanation-2: -It is thought that their ancestor, and closest known relative, is the dull-coloured grassquit, which is found on mainland South America. Once the original grassquits arrived at Galapagos, they diversified and adapted to the different environments found on the Islands, eventually becoming different species.
Detailed explanation-3: -Comparisons of DNA sequences revealed the evolutionary relationships among finch species. The data showed that all finch species living in the Galápagos Islands today are more closely related to one another than to any species of birds on the mainland, suggesting that they originated from a common ancestor.
Detailed explanation-4: -1: Darwin’s Finches: Darwin observed that beak shape varies among finch species. He postulated that the beak of an ancestral species had adapted over time to equip the finches to acquire different food sources. This illustration shows the beak shapes for four species of ground finch: 1.