A) prior to 4600 million years ago
B) between 4600 and 3600 million years ago
C) more than 3600 million years ago
D) during some other period.
Correct Answer: C
Solution :
: Cyanobacteria (cyanophyta) are group of bacteria, previously known as blue-green algae. They are unicellular and non-motile, often coated with mucilagenous slime, and the photosynthetic membranes occur as thylakoids within the cell cytoplasm rather than being in a membrane-bounded chloroplast. The cyanobacteria have an extensive fossil record. The oldest known fossils, in fact, are cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old.
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