Final answer:
Calculating the average percent of food items eaten provides insight into the variety and suitability of food sources for birds with different beak sizes.
Step-by-step explanation:
Calculating the average percent of food items eaten is important because it takes into account the proportion of each type of food item consumed by the birds. Relying solely on the average number of food items eaten would not provide insight into the variety and suitability of the food sources. By calculating the average percent of food items eaten, we can determine which bird beak had the advantage in the environment based on its ability to consume a larger range of food items.
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