Question

1. which is an example of a vestigial structure mentioned in the text?

the humerus bone in a bat wing
the wings of a bird
the human appendix
the heart in a mammal

Explanation:

A vestigial structure is a body part that has lost its original function through evolution. The human appendix is a classic example of a vestigial structure as it no longer serves a significant digestive function in humans, unlike its possible ancestral role. The humerus in a bat wing is part of a functional wing (for flight), bird wings are functional for flight, and a mammal's heart is a vital functional organ.

Answer:

C. The human appendix