Discussion
A climate proxy is
Answer: A
Correct answer: a measurable quantity that varies with climate
A proxy is something preserved in a natural archive whose value depended on climate at the time it formed - a ring width, an isotope ratio, a pollen assemblage - and which can therefore be calibrated against instrumental records and used to infer climate before those records began. It is an indirect measurement, which is exactly what distinguishes it from a thermometer reading.
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