What does the presence of a vestigial structure in a modern organism indicate?
a
Natural selection prepares the body of organisms so that, in the future, the vestigial structures may be used.
b
The vestigial structure was not used by the modern organism, so it became nonfunctional within the organism's lifetime.
c
A limited number of genes are expressed during the lifetime of an organism.
d
The structure was probably functional in some ancestor of the modern organism.
The answer is D, The structure was probably functional in some ancestor of the modern organism. Vestigial structures are structures that have remained from ancestors but have no function in modern times.
