• All of today’s camels are descended from the same camel ancestors.
  • These ancestors lived in North America about a million years ago.
  • Through natural selection, descendants of the original camel ancestors evolved the diversity they have today.
  • The biogeography of islands yields some of the best evidence for evolution.
  • Consider the birds called finches that Darwin studied on the Galápagos Islands (see Figure below).
  • All of the finches probably descended from one bird that arrived on the islands from South America.
  • The first bird was a seed eater.
  • It evolved into many finch species.
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