Question

Q2. What is one cause of oxygen being found in atmosphere?
​

Answer 1

Explanation:

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

Explanation:

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.

@VillinousRuby❤️