Which of the following accurately compares CO2 levels during cold glacial periods and warm interglacial periods?
A. CO2 levels of cold glacial periods were about the same as warm interglacial periods.
B. CO2 levels of cold glacial periods were more variable than warm interglacial periods.
C. CO2 levels of cold glacial periods were higher than warm interglacial periods.
D. CO2 levels of cold glacial periods were lower than warm interglacial periods.
Answer: D
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