Which one is not a vestigial structure in humans
Vestigial organs- The organs which occur in reduced form and are useless to the possessor, but are homologous to the fully developed, functional organs of related animals.
Human body- There are about 90 vestigial organs in the human body. The conspicuous among these are tail bone, canine and wisdom teeth, body hair and mammae in man, third eyelid, auricular muscles of pinna, caecum and vermiform appendix.
So, the correct answer is 'Epiglottis/Intestine'.