vestigial organ
A type of homologous structure that is rudimentary and of marginal or no use to the organism.
viable ...
Humans, too, have vestigial organs. The fused vertebrae which make up the base of the human spine are the vestigial remnants of the tail of our ancestors.
appendix Blind sac at the end of the large intestine that usually ruptures during final exams; a vestigial organ in humans.
Archaea Proposed, but not widely accepted, sixth taxonomic kingdom that would include the archaebacteria.
His writings on both botany and zoology contained many comments that suggested the possibility of common descent based on changes undergone by animals during development, artificial selection by humans, and the presence of vestigial organs.
 See also: Plant, Organ, Species, Animal, Trans
  
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