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Ileum, caecum and colon of rabbit, showing Appendix vermiformis on fully functional caecum The human vermiform appendix on the vestigial caecum. The appendix was once believed to be a vestige of a redundant organ that in ancestral species had digestive functions, much as it still does in extant species in which intestinal flora hydrolyze cellulose and similar indigestible plant materials. [10]
In humans, the vermiform appendix is sometimes called a vestigial structure as it has lost much of its ancestral digestive function.. Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. [1]
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English: Naked female and male human body with labels. Français : Vue antérieure d'humains de sexes féminin et masculin. Plus d'informations sur l'image originale en anglais: File:Anterior view of human female and male, with labels.jpg .
English: Naked female and male human body with labels. Français : Vue antérieure d'humains de sexes féminin et masculin. Plus d'informations sur l'image originale en anglais: File:Anterior view of human female and male, with labels.jpg .
Date: 2 January 2012: Source: Own work.This file was derived from: Front view of a woman.jpg Author: Taken at City Studios in Stockholm (www.stockholmsfotografen.se), September 29, 2011, with assistance from KYO (The organisation of life models) in Stockholm.
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This phenomenon is an automatic-response mechanism that activates even before a human becomes consciously aware that a startling, unexpected or unknown sound has been "heard". [2] That this vestigial response occurs even before becoming consciously aware of a startling noise would explain why the function of ear-perking had evolved in animals.