Studies reveal that during colder glacial periods,CO₂ levels ____ during warmer interglacial periods. A) were higher than B) were lower than C) were about the same as D) were more variable than

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Studies have shown that during colder glacial periods, atmospheric COS levels were lower than during warmer interglacial periods.

Studies Reveal That During Colder Glacial Periods,CO2 Levels ____ During

Studies Reveal That During Colder Glacial Periods,CO₂ Levels ____ During