What prevents natural selection from removing vestigial structures from a species? a) they have not yet become useful b) they were never harmful or beneficial to a species c) they are not genetic traits d) they are neither harmful nor beneficial to individuals

The answer would be D.

A "vestigial structure" or "vestigial organ" is an anatomical feature or behavior that no longer seems to have a purpose in the current form of an organism of the given species. Often, these vestigial structures were organs that performed some important function in the organism at one point in the past.

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It is used to during sexual reproduction between humans