The first significant injection of oxygen into the environment was the result of
A) prokaryotic photosynthesis using photosynthetic pigments.
B) prokaryotes using organelles, which detoxified oxygen.
C) photosynthesis by chloroplasts in eukaryotes.
D) energy metabolism in mitochondria of eukaryotes.
E) improved gas and nutrient exchange allowed by the flexible cell membranes of eukaryotes.

Question

Quizplus · Accepted Answer

Prokaryotic photosynthesis using photosynthetic pigments was responsible for the first significant injection of oxygen into the environment. This oxygen eventually allowed for the evolution of aerobic organisms.

The First Significant Injection of Oxygen into the Environment Was