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Which of the following eras, in geological time scale corresponds to the period when life had not originated upon the earth?

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Which of the following eras, in geological time scale corresponds to the period when life had not originated upon the earth?
A. Azoic
B. Palaezoic
C. Mesozoic era
D. Archaeozic
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Azoic era is the era of no life. It existed about 4600 milion years ago when only solar system had originated.
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