__________ serves as a molecular clock that measures the approximate time since two species diverged.

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rRNA is a component of the ribosome, which is responsible for protein synthesis. It is highly conserved across species and evolves relatively slowly, making it a useful molecular clock for measuring the evolutionary divergence between different organisms. Comparing the differences in rRNA sequences between two species can give an estimate of how long ago they diverged from a common ancestor.

__________ Serves as a Molecular Clock That Measures the Approximate