Answer :
Vestigial structures. These are structural elements that once served a purpose but as the organism evolved now serves no purpose.
Every structure in the organism has special function inside the body. Some structures that has no purpose in an organism is called a vestigial organ.
What are vestigial organs?
The organs that are of no use but were active in the ancestors are called vestigial organs.
In human body the vestigial organs are ear pinna, appendix, nictitating membrane in eyes, etc.
All of these structures were functional in ancestors but in the present generation they lost their functionality but are present as a vestigial organ.
Thus, the structure that seems to serve no purpose in an organism is called vestigial organ.
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