Why do scientists consider vestigial structures (like a human appendix) evidence for evolution?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Why do scientists consider vestigial structures (like a human appendix) evidence for evolution?

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Vestigial organs are some organs in host body which are no use to the host organisms. These are throught to lost its function in the host organisms throughout the course of evolution but have retained the struture . 

It was charles darwin himself who first propogated the idea that vestigal organs are evidence for evolution in his book origin of species . 

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