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Concept 26.4: An organism’s evolutionary historyis documented in its genome• Comparing nucleic acids or other molecules toinfer relatedness is a valuable tool for tracingorganisms’ evolutionary history• DNA that codes for rRNA changes relativelyslowly and is useful for investigating branchingpoints hundreds of millions of years ago• mtDNA evolves rapidly and can be used toexplore recent evolutionary eventsCopyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings