The ocean is a emormous producer of oxygen. Marine organism produce over half the oxygen that we and animals have to breathe. The ocean provides 70% of the Earth's oxygen. It was produced by tiny little marine plants called phyoplankton. Phytoplanton was the main foundation for the oceanic food chain. Phytoplankton is make up microalgae which are dinoflagellates and diatoms which evolved and makes it the most plentiful photynthetic organisms in the ocean today. There are up to 100,000 different species of diatoms and 2000 species of dinoflagellates that are eukaryotic singled celled algae 28% of the Earth's oxygen comes from rainforests and the other 2% come from other sources. Another organism that produces oxygen is cyanobacteria or known
