The bird ancestor<>lived<>in trees$$$wings<>is commonly associated<>with birds
For example, the wings of birds, human arms, and pectoral fin in fish are all derived from a common ancestor In contrast, features that are similar because they have evolved in response to a common environmental pressure are said to be analogous.
The bird ancestor that lived in trees developed wings, which is commonly associated with birds.
The bird ancestor that lived in trees developed what feature commonly associated with birds?