Changes

| style="height:20px; width:200px; text-align:center;" |Millions of years ago all [[Giraffe]]s had short necks. [[Variation]] meant some Giraffes [[Giraffe]]s were a little bit taller than others. Those Giraffes [[Giraffe]]s could get to the higher leaves in trees. This meant they could eat more. The shorter Giraffes [[Giraffe]]s couldn't get enough food and died. So the taller Giraffes survived and so their [[offspring inherited ]] [[inherit]]ed their slightly longer necks.| style="height:20px; width:200px; text-align:center;" |After a few generations all the giraffes [[giraffe]]s had slightly longer necks, but because of [[variation ]] some had even longer necks still. This meant they they were more likely to get food, survive and have children than the shorter giraffes[[giraffe]]s. So their offspring inherited [[inherit]]ed these even longer necks.

| style="height:20px; width:200px; text-align:center;" |Millions of years later, after many generations, eventually all the [[Giraffe ]] had very long necks.