For function as an evolutionary chronometer, it is important that

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    the molecule be universally distributed across the group chosen for study.
     the molecule be functionally homologous across the group chosen for study.
     that there be some way to align the molecules for sequence comparison.
     all of the above are important.
asked May 16, 2012 in Microbiology by anonymous
    

1 Answer

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all of the above are important.
answered May 17, 2012 by Bioshare ~Top Expert~ (34,070 points)

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