Discussion
Assertion (A): No single proxy gives both high resolution and a very long record.
Reason (R): Fast accumulating archives are short lived while slow ones smooth out the detail.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. Fine resolution requires rapid accumulation, and a rapidly accumulating archive either fills its basin or outlives its organism within a few thousand years. A slowly accumulating one lasts far longer but averages each sample over centuries, and bioturbation smooths it further. That is why palaeoclimate reconstruction always combines archives rather than relying on one.
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