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Signals from ${ }^{ 13 }C$ are used in nuclear magnetic resonance for the determination of the structures of organic compounds, while the signals from ${ }^{ 14 }C$ are often used to determine the age of an object that contains organic materials.

What is the relationship between ${ }^{ 13 }C$ and ${ }^{ 14 }C$?


They are all isotopes of carbon.


They are all allotropes of carbon.


They are different molecules.


They are the same atom.

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