Although They Serve No Known Current Functions, Vestigial Traits May

Although they serve no known current functions, vestigial traits may persist in some organisms for all of the following reasons EXCEPT that

A) the trait is not costly to the organism.
B) the trait has some function that we have not identified.
C) there is some natural selection against the trait, and it is on its way out-eventually it will be lost.
D) natural selection cannot act to eliminate traits.

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