Final answer:
The biosphere and the atmosphere both play a role in the carbon cycle by exchanging carbon dioxide. Plants in the biosphere absorb carbon dioxide during photosynthesis, while carbon dioxide in the atmosphere dissolves in water and forms carbonate and bicarbonate ions.
Step-by-step explanation:
The biosphere and the atmosphere play important roles in the carbon cycle.
Plants in the biosphere absorb carbon dioxide from the atmosphere during photosynthesis, converting it into organic compounds.
At the same time, carbon dioxide in the atmosphere dissolves in water and forms carbonic acid, which then ionizes to carbonate and bicarbonate ions.