Many finches that Darwin observed on the Galapagos Islands changed over time from a single species that migrated from the South American mainland. The table shows six finches Darwin observed, the shape of their beaks, main food sources, and the habitats in which the birds could be
found.
Which characteristic contributes most to the survival of the different birds on the islands?
the populations of the birds on the island
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the habitats in which the birds live
the main food sources of the birds
the shapes of the birds' beaks