Answer:
More carbon dioxide gas would be found in the atmosphere.
Explanation:
Photosynthesis is a process during which green plants manufacture carbohydrates using inorganic products in the form of water and carbon dioxide. It is represented by the following equation:
[tex]6CO_2 + 6H_2O --> C_6H_1_2O6 + 6O_2[/tex]
Hence, if the number of photosynthetic organisms on the earth decreases drastically, more carbon dioxide (which could have been used up ordinarily) will be found in the atmosphere