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Q.
Discovery of fossils of cyanobacteria indicates that life originated sometime
AMUAMU 1998
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.