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Which Correctly Describes Carbon Dioxide (CO2)concentrations Over the Past 800,000

Question 105

Multiple Choice

Which correctly describes carbon dioxide (CO2) concentrations over the past 800,000 years? A) These have remained relatively constant. B) These were much higher in the past than the present. C) These fluctuated over time,but have been increasing since the Industrial Revolution. D) These reached a maximum about 325 000 years before present. Which correctly describes carbon dioxide (CO2) concentrations over the past 800,000 years?


A) These have remained relatively constant.
B) These were much higher in the past than the present.
C) These fluctuated over time,but have been increasing since the Industrial Revolution.
D) These reached a maximum about 325 000 years before present.

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