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Darwin believed that the various species of finches on the Galapagos islands came from one common ancestor.he believed they evolved by what?

Respuesta :

adaptive radiation 

(the diversification of a group of organisms into forms filling different ecological niches)
izzys6
He believed they evolved because of he food source. Whether the food was on a tree so they must have long necks or if the food was on the ground, therefore they did not need long necks.

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