A human forearm, a horse's front leg, a bat's wing, and a porpoise's flipper have similar bone structure. What conclusions can we draw from the similarities in bone structure between these mammals?
Such homologies do not exist in other areas of the vertebrate skeleton.
Similarities among vertebrate forelimbs suggest they evolved from a common ancestor.
Similarities among vertebrate forelimbs suggest they have evolved convergently.
The anatomy of the vertebrate forelimb is not currently undergoing natural selection.
Differences among vertebrate forelimbs suggest that they evolved independently.
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