What percentage of the world's oxygen is produced by algae?

Marine plants produce between 70 and 80 percent of the oxygen in the atmosphere. ... Not only do algae provide much of the Earth's oxygen, they are also the base for almost all marine life. ... They cover 2 percent of the Earth's surface or 6 percent of land, and are an important source of oxygen. read more

Most of the world's oxygen is produced by marine plants. Marine plants generate between 70 and 80 percent of our oxygen. Most of this comes from single celled photosynthetic algae. read more

Scientists believe phytoplankton in the Earth's oceans produce between 50 and 85 percent of the planet's oxygen. The exact figure is difficult to calculate because scientists do not know how much phytoplankton exists on Earth. read more