The existence of a large number of finch species on the Galapagos Islands is considered an example of adaptive radiation

The existence of a large number of finch species on the Galapagos Islands is considered an example of adaptive radiation (the formation of a large number of similar species from one ancestor). Explain, under the influence of what forces the formation of various species of finches (at the stage of formation) occurred. What forms of natural selection were at work?

1) Due to the high competition, the finches ate different types of food
2) As a result of natural selection, various beak shapes have formed, which have different food specialization
3) Over time, under the influence of driving selection, the adaptation of finches to the type of nutrition increases (stabilizing selection under these conditions retains the average value of the trait – food specialization)

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