: One of the most abundant photosynthetic organisms on Earth; it is estimated that one out of every five breaths we take originates from this single genus of bacteria.
), and water to create energy, releasing oxygen as a byproduct. : Oxygene - The Ocean
The primary source of ocean oxygen is microscopic organisms known as . These tiny, plant-like drifters live in the "photic zone"—the top 200 meters of the ocean where sunlight can reach. : One of the most abundant photosynthetic organisms