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Vestigial organsareorgansof the body which are smaller and simpler than those in related species. They have lost, or almost lost their original function. ... But one type of snake – the boas – havevestigialrear legs and pelvis. The human vermiform appendix is anotherexample.

Theexamplesof human vestigiality are numerous, including the anatomical (such as the human tailbone, wisdom teeth, and inside corner of the eye), the behavioral (goose bumps and palmar grasp reflex), and molecular (pseudogenes). Many human characteristics are alsovestigialin other primates and related animals.

The human vermiform appendix is the one of example of vestigial organ.

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... As theorgansare developed and functional in lower organisms, they act as the proof of evolution. Forexample, appendix, ear muscles, nictitating membrane of eye, mammary gland in man are some of thevestigial organspresent in human