Question

what is one cause of oxygen being found in the atmosphere​

Answer 1

❥ A᭄nswer✭࿐

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

Answer:

the answer is tiny organisms

Explanation:

they are known as cynobacteria.These microbes conduct photosynthesis using sunshine,water, carbon dioxide to produce carbohydrates