If the number of photosynthetic organisms on the earth decreased drastically, which would happen as a result? a. less water would be available on the earth’s surface. b. less solar energy would reach the earth’s atmosphere. c. more oxygen gas would be found in the atmosphere. d. more carbon dioxide gas would be found in the atmosphere.

 d. More carbon dioxide gas would be found in the atmosphere.

Explanation:

The photosynthetic organisms or the autotrophs are the organisms which are capable of producing their own food by utilizing the carbon dioxide, water  in the presence of sunlight. The carbon dioxide is the chief ingredient required for the process of photosynthesis. The photosynthetic organisms are called as carbon sinks as they absorb the atmospheric carbon dioxide. If the number of these photosynthetic organisms decrease then the more amount of carbon dioxide will be found in the atmosphere.