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What is a vestigial structure?

What is a vestigial structure? Here are some definitions.

Noun
  1. (evolutionary theory) A structure in an organism that has lost all or most of its original function in the course of evolution, such as human appendixes.
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Examples
Once regarded as a vestigial structure, the role of the meniscus as crucial element of knee function and health has never been more evident.
In order for a vestigial structure to be considered genuine the part in question must serve no contemporary useful purpose.
Two days later, the Irish Army corp of engineers blew up the rest of the pillar after judging the vestigial structure to be too unsafe to restore.
The mammalian pronephros is a rudimentary vestigial structure.
It is a vestigial structure representing the lower fused segments or remnants of Mullerian or paramesonephric ducts and analogous to uterovaginal canal in female.
Early growth and differentiation of breast tissue occurs in both sexes, but post-natal development is confined to females and the breast is a vestigial structure in the adult male.

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