Nature maintains a balance of carbon dioxide and oxygen in the atmosphere.
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Answer:
The balance of carbon dioxide and oxygen in atmosphere is mainly maintained by the oxygen released and carbon dioxide consumed during photosynthesis by plants. It is also regulated by the carbon dioxide released by animals during respiration. Thus, the correct answer is 'Photosynthesis.
☯ AnSwEr :
"Nature maintains a balance of carbon dioxide and oxygen in the atmosphere".
Explanation of sentence : There are plants in enviornment which make their food by using photosynthesis. They intake the carbon dioxide and release the oxygen. Both are maintained. From the last 50 years there is 0.02% of carbon dioxide and 21% of oxygen. Because there is balance betwwen carbon dioxide and oxygen. If the amount of carbon dioxide will increase on the enviiornment then it would be harmful for us. And, if the amount of oxygen will increase then it will also be harmful for us. This states that "Nature maintains a balance of carbon dioxide and oxygen in the atmosphere".