Dogs have a reduced nonfunctional digit on their paws known as a dewclaw. what is this an example of?
analogous structure
homologous structure
vestigial structure
mutated structure

The correct answer is Vestigial structure, and this is why:
a vestigial structure is a structure that has lost most of its ancestral function. So the reduced nonfunctional digit (dewclaw) would be considered a vestigial structure.

The answer is a because - is an direction