Phylogenetic tree for Buttons.
The rules were she needed at least 2 Domains:
Bead Buds (single hole organisms and Button Buds two hole organisms).
And 2 cases of parallel evolution:
Development of 4 holes and loss of flatness.
Characteristics she used to classify the buttons included the number of holes (1,2,4 or none), size, color (straight or shell/pearl), shape (flatness or loss of flatness/development of small loop, development of a dimple), and material (plastic, shell, or metal).
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