Vestigial structures in the bodies of organisms are used as
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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.