The Galápagos Islands where Darwin
saw a variety of animals and plants, many of which were not only
native to the island group as a whole, but some were also unique to
a specific island. The finches, tortoises, and lizards were
especially instructive to him, indicating isolation of mainland
organisms that, after reaching the islands, underwent what he was
to later call, "descent with modification" (i.e., evolution) from
the parent species.
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