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Examples

  • Or conversely, if the mechanisms used by the afrotheria, the xenarthra, and the other mammalian groups that lack an appendix to switch off appendix development were identical, that would suggest that the last common ancestor of the eutheria had that mechanism, lacked an appendix, and those euarchontoglires definitely did re-evolve the appendix.

    Evolution of the appendix? - The Panda's Thumb 2009

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