State one way by which Carbon Dioxide decreases in the atmosphere

The early atmosphere was mainly carbon dioxide and water vapour. Water vapour condensed to form the oceans. Photosynthesis caused the amount of carbon dioxide to decrease and oxygen to increase.

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Photosynthesis removes carbon dioxide naturally — and trees are especially good at storing carbon removed from the atmosphere by photosynthesis.

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i do not know and i have a 100 in this class

i think that d. wind is the answer.   i missed the question when i answered a. currents.