The Level of Atmospheric CO₂ Has Varied Considerably Over the History

question 44

Multiple Choice

The level of atmospheric CO₂ has varied considerably over the history of Earth.Currently, the level of atmospheric CO₂

• A) is greater than it was during the time of the dinosaurs.
• B) favors C₄ plants under hot conditions.
• C) has resulted in maximum CO₂ fixation by rubisco.
• D) is decreasing.
• E) prevents the occurrence of photorespiration.

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