_________ in our atmosphere is a direct consequence of the emergence of life.
A) Carbon dioxide
B) Water vapor
C) Nitrogen
D) Oxygen
E) Helium

Question

Quizplus · Accepted Answer

Oxygen is the gas that is a direct consequence of the emergence of life. Oxygen is produced by photosynthetic organisms, such as plants and algae, through the process of photosynthesis. Before the emergence of life, the Earth's atmosphere had very little oxygen. It was the emergence and proliferation of oxygen-producing organisms that gradually increased the oxygen levels in the atmosphere to the level we have today.

_________ in Our Atmosphere Is a Direct Consequence of the Emergence