how can you say photosynthesis maintains balance between oxygen and carbon dioxide in the atmosphere

Question

​how can you say photosynthesis maintains balance between
oxygen and carbon dioxide in the atmosphere

Chrismica Maria Roy · Accepted Answer

We can say photosynthesis maintains a balance in the oxygen and
carbon dioxide in the atmosphere as in the process plants take in
Carbon Dioxide and release oxygen

​how can you say photosynthesis maintains balance between oxygen and carbon dioxide in the atmosphere