The ¹³C/¹²C Isotopic Ratio of Geological Rocks of Different Ages

question 28

Multiple Choice

The ¹³C/¹²C isotopic ratio of geological rocks of different ages has been used as evidence for or against past biological activity,because compounds of biological origin

• A) do NOT contain ¹³C.
• B) have a higher proportion of ¹³C that compounds of geological origin.
• C) have a lower proportion of ¹³C that compounds of geological origin.
• D) are not well preserved in geological samples.

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