Answer: The oxygen released by photosynthesis is used in cellular respiration
Explanation: The process of photosynthesis takes place by the help of carbon dioxide, water and sunlight.
The product of photosynthesis is carbohydrates and the by product is oxygen. This oxygen is used in the process of cellular respiration in which the carbohydrates is broken down in the presence of oxygen and the energy is stored in the form of adenosine triphosphate.