What component of the earth's atmosphere is decreased due to photosynthesis

The component of the Earth's atmosphere of many gasses, is decreases due to the process of photosynthesis, would be the carbon dioxide component, CO2 gas, as plants and other primary producers, utilize this gas, a product for which is breathed out in plants and animals, to incorporate into the second step of photosynthesis. Ultimately to make sugars, glucose.

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for

The correct answer to this question would be c