The answer is population density
I believe the correct answer from the choices listed above is option D. Based on the time scale, it would be that <span>the atmosphere was formed after microscopic life appeared on Earth that is the correct inference. It is very clear in the picture as the microorganisms appear before the atmosphere. Hope this answers the question. </span>
Answer:
Yes, they present everywhere in our environment.
Could you give me your answers so that I can better answer the question?