. Life originated in-

A.         Mesozoic       

B.         Coenozoic      

C.         Precambrian  

D.         None of these

Best Answer

C.     It is not known when life originated, but carbon in 3800 million year old rocks from islands off western Greenland may be of organic origin. Well-preserved bacteria older than 3460 million years have been found in Western Australia. Probable fossils 100 million years older have been found in the same area. There is a fairly solid record of bacterial life throughout the remainder of the Precambrian.

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