The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group of bacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen. That group of bacteria was:
A. cyanobacteria
B. proteobacteria
C. spirochaetes
D. Staphylococcus
E. actinobacteria
Answer: A
Biology & Microbiology
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