Answer:
b. human tail bone. is the correct answer.
Explanation:
An example of a vestigial structure is the human tail bone.
vestigial structures organs that were present in the organism that performed major functions in the past.
The vestigial structure has lost its initial function during the evolution.
vestigial structures important are because it explains how the system has evolved in the past.
Vestigial structures in individuals and animals helped to know about the different varieties of species that existed earlier and how they adjusted to the conditions.