Throughout the day there are changes in carbon dioxide concentration. The peak is at 8 AM at 1000 ppm and The lowest is at 4 PM at approximately 700 ppm. The earlier it is, the more concentration of carbon dioxide and in the evening it is there is less concentration of carbon dioxide . Hope this helps :)
There are 2 high tides and 2 low tides every 24 hours.
Answer: Gradualism (C)
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