Historically,an Unusual Aspect of the Recent Rise in CO₂ Levels

question 51

Multiple Choice

Historically,an unusual aspect of the recent rise in CO₂ levels is that

• A) there is no known mechanism for its occurrence.
• B) CO₂ reacts so quickly with other compounds that it should not be occurring.
• C) it has occurred relatively slowly.
• D) it has occurred relatively rapidly.

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Definitions:

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Serious Illness

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