The ribosomal RNA (rRNA) genes of different organisms are often compared as a means to classify them because rRNA genes evolve much more slowly than other genes.

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rRNA genes are highly conserved across different organisms, making them ideal for phylogenetic studies and classification because their slow rate of evolution allows for the comparison of organisms that diverged from a common ancestor millions of years ago.

The Ribosomal RNA (RRNA) Genes of Different Organisms Are Often