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.
Answer: C
Biology & Microbiology
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