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Ancestral Trait


A student is comparing traits for five related bird species. She makes a chart and records data for four different traits. She then uses the chart to make a cladogram showing her hypothesized relationships among the species.

1 2 3 4 5
Head Size 20 cm 20 cm 20 cm 20 cm 20 cm
Beak Color Black Blue Blue Black Black
Eye Color Black Black Red Red Red
Eye Number 2 2 2 2 3

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Based on the chart, which of the following is an ancestral trait for all of these species?


20 cm head size.


Blue beak color.


Red eyes.


Three eyes.