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1) What is the average time resolution for an ice core study that measures co2 concentrations in ice layers from years 1200, 1400, 1500, and 1750

2) Foraminifera use seawater chemicals to build their shells which:

a) can be measured in tree rings to provide a climate proxy

b) is trapped in layers of ice in Antarctica dating back 800,000 years

c) are archived in historical artist paintings

d) can be used with isotope measurement to estimate global temperature

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