Archaeopteryx fossils show that the animal had feathers like a bird. It also had a bony tail, teeth, and claws on its wings like a reptile. Scientists claim this is evidence of a common ancestor. What makes this a sound claim?

A common ancestor can be supported by an organism that has characteristics of two groups. Archaeopteryx had birdlike feathers as well as reptile-like traits, including a bony tail, teeth, and claws on its wings. This combination of traits is why the fossils support a connection between birds and reptiles. Choice B says that Archaeopteryx fossils share traits with both groups.

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