What kinds of organisms are essential for the carbon cycle?
Green plants and algae remove carbon dioxide from the environment for photosynthesis and in turn provide oxygen and glucose. Any animal that requires oxygen (including humans) then use the oxygen and glucose during cellular respiration thus returning the carbon dioxide and water. Decomposers such as fungi and bacteria are also critical to returning carbon to the atmosphere by feeding on dead and rotting plants and animals. Basically, almost every living organism plays a role in the carbon cycle.
