During the first major divergence of life, the atmosphere was ____.
A) high in oxygen, high in carbon dioxide
B) high in hydrogen, low in oxygen
C) changing from anaerobic to aerobic
D) firmly in the age of aerobes
E) high in oxygen, low in carbon dioxide

Question

During the first major divergence of life, the atmosphere was ____.
A) ​high in oxygen, high in carbon dioxide
B) ​high in hydrogen, low in oxygen
C) ​changing from anaerobic to aerobic
D) ​firmly in the age of aerobes
E) ​high in oxygen, low in carbon dioxide

Quizplus · Accepted Answer

During the first major divergence of life, the atmosphere was high in hydrogen and low in oxygen, as it was primarily composed of gases like hydrogen, methane, and ammonia, with little to no free oxygen.

During the First Major Divergence of Life, the Atmosphere Was