Answer is Carbon and Oxygen cycles
The oxygen cycle and carbon cycle are two biogeochemical cycles which depends on photosynthesis process.
Photosynthesis is a process in which green plants capture and use sunlight as source of energy for the synthesis of carbohydrate (food) from carbon dioxide and water. During photosynthesis oxygen is released as a by-product.
The oxygen released during photosynthesis is used in cellular respiration. During cellular respiration, carbon dioxide is released which is used in photosynthesis. Thus, oxygen cycle and carbon cycle depends on photosynthesis process.
