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

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Vestigial traits persist because they are not costly to the organism, have some unidentified function, or are on their way out but do not persist because natural selection cannot act to eliminate traits. In reality, natural selection is constantly acting to eliminate traits that are not beneficial to an organism's survival and reproduction.

Although They Serve No Known Current Functions, Vestigial Traits May