What are the categories needed to understand an age structure graph?

here is a answer

Explanation:

The different age-structure diagrams are represented by different shapes. Four general types are the pyramid, column, an inverted pyramid (top-heavy), and a column with a bulge.

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.