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Charlie Lem Charlie Lem
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2 years ago
Refer to the figure. What can you conclude from the data shown on this graph alone?

a. The carbon dioxide concentration varies naturally, but is much higher today than it has been in the past 800,000 years.
      
b. Human activity has caused the carbon dioxide concentration to rise and fall many times in the past 800,000 years.
      
c. If current trends continue, carbon dioxide will soon be the most abundant gas in Earth's atmosphere.
      
d. Changes in the carbon dioxide concentration are the causes of ice ages.
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bio_manbio_man
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