Photosynthesis is the Major Source of Oxygen in Earth's Atmosphere

Question

Photosynthesis is the major source of oxygen in Earth's atmosphere.

Accepted Answer

Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy and produce oxygen (O2) as a byproduct. This oxygen becomes a part of Earth's atmosphere and makes up approximately 21% of the gases present in the atmosphere. Therefore, photosynthesis is the major source of oxygen in Earth's atmosphere.