What causes the level of atmospheric CO₂ to rise and fall throughout the year?

Question

Quizplus · Accepted Answer

The rise and fall of atmospheric CO₂ levels is primarily due to plant growth and dormancy throughout the year as the seasons change. During the growing season, plants take in CO₂ through photosynthesis, which contributes to a decrease in atmospheric CO₂. During dormancy, plants respire and release CO₂, which contributes to an increase in atmospheric CO₂.

What Causes the Level of Atmospheric CO₂ to Rise and Fall