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|[[File:GiraffeEvolution.png|center|400px]]
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| style="height:20px; width:200px; text-align:center;" |The [[giraffe ]] used to have a short neck. Over many generations the population of giraffes [[giraffe]]s had longer and longer necks.
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|+Millions of years ago the [[Arctic Fox|arctic fox ]] and the [[Desert Fox|desert fox ]] were the same [[species]].| style="height:20px; width:200px; text-align:center;" |[[Arctic Fox]]| style="height:20px; width:200px; text-align:center;" |[[Desert Fox]]
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|[[File:ArcticFox.png|center|200px]]