Question

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

Explanation:

A vestigial structure is a remnant of a structure that had a function in an ancestor but is now reduced and non - functional or has greatly reduced function. The dewclaw in dogs is a reduced, nonfunctional digit, so it fits the definition of a vestigial structure. Analogous structures have similar functions but different evolutionary origins. Homologous structures are similar due to common ancestry and may have similar or different functions. Mutated structure is not a standard term for this concept; mutations are changes in DNA, and this is about a remnant structure.

Answer:

C. vestigial structure