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Vestigial Organs What Is A Vestigial Organ? It is an organ that was thought to be useful in an organism at one time but which no longer has a known use in that organism.. Vestigial Organs Darwin said, “…it is quite possible for natural selection gradually to fit a being to a situation in which several organs would be superfluous or useless,” Charles Darwin, The Origin of Species by Charles Darwin. 1993 Modern Library Edition by Random House, Inc., New York. P. 161. Think Critically * If an organ becomes useless has the information content in the DNA increased or decreased? * Has the Organism Complexity Increased or Decreased? * What kind of evolution is indicated by vestigial organs? Click to Return to PPT List Click to go to Biochemistry