Which might increase the human carrying capacity during the twenty-first century?

Identify the missing parts of the carbon cycle

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?