Question

What is the major source of pure oxygen in the biosphere? Please answer in one word.​

Answer 1

Answer:

The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen...

Answer 2

Question:

• What is the major source of pure oxygen in the biosphere?

Answer:

• Ocean.

Hope its help uhh :)