Vestigial structures, such as hip bones in whalesand appendixes in humans, are those that havelittle or no function for the organism. What is themost likely reason for this loss of function overtime

This structure has not been highly beneficial for the organism

Explanation:

Vestigial structures are cells, tissues, and/or organs that have no apparent function. Vestigial structures are retained during the course of the evolution, but often they are degenerate and/or atrophied (due to disuse). In general, these structures are homologous to anatomical structures that play a specific role in evolutionarily related species. Some examples of vestigial structures include, among others, the presence of the appendix in humans and wings in flightless birds.

the answer is d. chordata

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