<em><u>Answer:</u></em>
<em><u>A very, very famous example is the Galapagos finches
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<em><u>They all radiated from a common ancestor. With a overcrowding of population and genetic differences, different species of birds radiated from the common ancestor and now eat a variety of foods.
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<em><u>Each finch group now has a unique niche, though the common ancestor diet had a different diet
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<em><u>ANOTHER is Polar Bears
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<em><u>In the past they relied solely on seals and breathing hole in the ice as hunting grounds
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<em><u>With current global warming, many are struggling for survival and turning to other food sources such as human waste; as seals can no longer provide a adequate food source, the ice is melting and the hunting grounds disappearing with the ice. </u></em>
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<em><u>Explanation:</u></em>