Posted by kelly on Monday, December 17, 2007 at 8:55pm.
due to natural selection the amount of birds that have lived throughout the 20 year period have been the birds with the bigger beaks because the food they need for survival burrows further into the ground therefor the lengths of the beaks for the birds must accommodate for the change thus the birds that lived have bigger beaks...something along those lines
if that doesnt make sense make it into your own words mentioning how the food goes deeper so the birds need bigger beaks to survive that where natural selection comes in because the birds who dont survive dont have big enough beaks and the birds that do survive "evolve" so to speak to have bigger beaks =]
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