Why is DNA a useful evolutionary clock?
DNA mutations cause organisms to diverge evolutionarily from one
DNA is the only substance in an organism that never changes.
DNA contains no carbon, so it is not affected by radioactive decay.
DNA decays steadily over time once an organism dies.

The more closely related two organisms are, the less different their DNA will be. Because there are tens of thousands of genes in humans and other organisms, DNA contains a tremendous amount of information about the evolutionary history of each organism.

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Why is DNA a useful evolutionary clock? DNA mutations cause organisms to diverge evolutionarily from one DNA is the only substance in an organism that never changes. DNA contains no carbon, so it is not affected by radioactive decay. DNA decays steadily over time once an organism dies.

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Why is DNA a useful evolutionary clock?
DNA mutations cause organisms to diverge evolutionarily from one
DNA is the only substance in an organism that never changes.
DNA contains no carbon, so it is not affected by radioactive decay.
DNA decays steadily over time once an organism dies.