A) 3300 to 3500
B) 3000 to 3300
C) 3500 to 3800
D) 3800 to 4000
Correct Answer: B
Solution :
Because in the Archeozoic era or 3000 to 3300 million years ago, these bacteria were present. Fossils of Cyanobacterium and photosynthetic bacteria have been found which are 3000 million years old.
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