Why Is It Necessary to Have a Standard for the Interpretation

question 4

Multiple Choice

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

• A) A standard is necessary to calculate how much radioactivity was added to a sample.
• B) A standard is necessary to determine the stable isotope ratio in the absence of biological activity.
• C) A standard is necessary to determine the weight of each isotopes.
• D) A standard is necessary to determine the age of the sample.

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