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 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.
Correct Answer:

Verified
Correct Answer:
Verified
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Q6: In an agar dilution tube, microbial colonies
Q7: Organisms in natural environments can be detected
Q8: Which approach would help to identify biologically
Q9: The methodology of microbial ecology includes<br>A) enrichment
Q11: Well-designed microbial activity measurements can reveal _
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