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The graph shows data from ice cores. What has happened to carbon dioxide
levels over time?

A. They have skyrocketed.
B. They have remained steady.
C. They have plummeted.
D. They have gone up and down with no general trend.

The graph shows data from ice cores What has happened to carbon dioxide levels over time A They have skyrocketed B They have remained steady C They have plummet class=


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