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Droughts, such as those seen in california, can affect availability of important food sources for certain bird species. as such food source availability can cause birds with small beaks as well as those with large beaks to be more successful than the rest of the population. this is an example of

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metchelle

Based on the given scenario above which describes about a certain bird specie and that their beak sizes makes a difference in survival, this would be considered as an example of NATURAL SELECTION. This is based on Charles Darwin's study. Hope this answers your question.

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