When monthly measurements of carbon dioxide levels are taken in a remote island in hawaii, the levels cycle up and down depending upon the season of the year. this is primarily because of changes

The increasing and decreasing processes of photosynthesis are heavily responsible for the up and down levels of the carbon dioxide of the cycle upon the seasons of the year. It mostly occurs in the plants at the Northern Hemisphere. During winter, photosynthesis decreases thus CO2 amounts also increase.

The answer is b hope this