How much oxygen comes from the ocean?

At least half of the oxygen produced on Earth comes from the ocean, mostly from tiny photosynthesizing plankton. But marine life also uses roughly the same amount of oxygen to breathe, for cellular respiration, and in the decomposition process.

What Is Ocean Acidification?

Ocean - Wikipedia

How Much Oxygen Have Our Oceans Lost? Envirotech Online

Can the ocean run out of oxygen? - Kate Slabosky

How does the ocean produce more than 50% oxygen on Earth? What is

What percentage of oxygen is produced by the ocean? - Quora

Frontiers Health Risks and Benefits Among Surfers After Exposure

World Oceans Day

Oceans' phytoplanktons produce more oxygen than trees and plants

That Sinking Feeling: 5 Things I Learned From 'Seaspiracy

View of Atlantic Ocean and distant mountains, choppy water, calm

From NOAA: “How much oxygen comes from the ocean?” – sciencesprings