What is the correct order in which the following appeared during the early evolution of life on Earth?
A) Oxygen,ozone,photosynthesis,life on land
B) Photosynthesis,oxygen,ozone,life on land
C) Life on land,photosynthesis,oxygen,ozone
D) Ozone,oxygen,photosynthesis,life on land
E) Oxygen,photosynthesis,life on land,ozone

Question

Quizplus · Accepted Answer

Photosynthesis was the earliest process to appear, followed by the accumulation of oxygen in the atmosphere. Ozone formation came after the buildup of oxygen in the atmosphere, which resulted in protection for life on land from damaging ultraviolet radiation. Life on land could only have appeared after this protective layer was established. Therefore, the correct order is Photosynthesis, oxygen, ozone, life on land.

What Is the Correct Order in Which the Following Appeared