Environment & Ecology · Environmental Science
Among the following geological and biological markers, which serves as the most reliable direct proxy for determining ancient atmospheric CO2 levels?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Magnetic susceptibility of deep-sea sediments
- 2Stomatal index of fossil plant leaves✓
- 3Oxygen isotopes (δ18O) in benthic foraminifera
- 4Speleothem growth rate
Correct answer
Stomatal index of fossil plant leaves
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