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Image Description: Ancestor finch - natural selection leads to the following beak types: insect eating, woodpecker type insect eating, and seed eating.

What contributed to the natural selection of the finches' beaks?

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Genetic variation for beak size existed within the population.

Eating tough seeds made their beaks thicker.

There was an abundance of food available for all finches.

Certain beak shapes were better suited for different food sources.

Reproduction increased in individuals who located enough food.

The variation in finch beaks arose due to natural selection favoring specific beak shapes for different food sources. Inherited beak size variations within the population meant some finches could access certain foods more easily. These finches thrived, reproduced, and passed on their well-suited beak traits. Over generations, this led to the remarkable diversity in beak shapes seen today, where each beak is optimized for the finch's preferred food source.