Which biological process contributes to the oxygen cycle?

Photosynthesis is a critical biological process that contributes significantly to the oxygen cycle. During photosynthesis, plants, algae, and some bacteria convert carbon dioxide and water into glucose and oxygen using sunlight as the energy source. This process not only produces food for the organism itself but also releases oxygen as a byproduct, enriching the atmosphere with this essential gas.

As a result, photosynthesis plays a crucial role in maintaining atmospheric oxygen levels, which is vital for the survival of aerobic organisms, including humans. The oxygen produced during photosynthesis is then used by living organisms in respiration, a process that consumes oxygen to release energy from food. Thus, photosynthesis is foundational in the oxygen cycle, facilitating the flow of oxygen into the environment and supporting life on Earth.