DNA or protein can be used as a "molecular clock" that tells how long it has been since two species have diverged from a common ancestor.

Name: DNA or protein can be used as a "molecular clock" that tells how long it has been since two species have diverged from a common ancestor.
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DNA or protein sequences accumulate mutations at a relatively constant rate over time, allowing scientists to estimate the time of divergence between species by comparing genetic differences.

DNA or Protein Can Be Used as a "Molecular Clock