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Why is it necessary to have a standard for the interpretation of stable isotope ratios?

risssssss

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Why is it necessary to have a standard for the interpretation of stable isotope ratios?

Why is it necessary to have a standard for the interpretation of stable isotope ratios?
A) A standard is necessary to calculate how rapidly the stable isotopes undergo radioactive decay.
B) A standard is necessary to determine the stable isotope ratio in the absence of biological activity.
C) A standard is necessary because samples are only presented in comparison with other samples of the same age.
D) A standard is necessary to determine the age of the sample.

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