What must be true of any organ that is described as vestigial?
A) It must be analogous to some feature in an ancestor.
B) It must be homologous to some feature in an ancestor.
C) It must be both homologous and analogous to some feature in an ancestor.
D) It need be neither homologous nor analogous to some feature in an ancestor.

Question

Quizplus · Accepted Answer

A vestigial organ is one that has lost its original function in the course of evolution. If an organ is homologous to a similar feature in an ancestor, but has lost its function, it can be considered vestigial. Analogy refers to a superficial similarity in function or form between different organisms or body parts, which may not have a common ancestry. Therefore, only homology is necessary for an organ to be considered vestigial.

What Must Be True of Any Organ That Is Described