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Refer to the figure. The figure shows the phylogeny of three extant species of turtles.Species 1 and 2 have a particular bone structure, while species 3 does not.The most generally accepted opinion is that the structure evolved after species 1 and 2 diverged from species 3.Recently, some scientists have questioned this and suggested that the structure evolved before species 1, 2, and 3 diverged from the common ancestor and that the structure was lost in species 3.Two fossils (A and B) have been discovered.Which information from these fossils would best support the new claim that species 3 lost the structure?
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