What had the most influence in irreversibly changing the Earth's atmosphere?
A) Formation of carbonic acid in the ocean
B) Production of oxygen from photosynthesis
C) Chemical breakup of water vapor by sunlight
D) Fluctuation in the atmospheric composition

Question

Quizplus · Accepted Answer

Although all these factors did occur, the addition of oxygen to the atmosphere changed the atmosphere forever. It was called the oxygen revolution. As more and more photosynthetic organisms evolved, more oxygen was added into the atmosphere. Information can be found in the section Earth, Ocean, and Atmosphere Accumulated in Layers Sorted by Density.

What Had the Most Influence in Irreversibly Changing the Earth's