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The largest hole in the Ozone layer spreading over 1 million square kilometers above the Arctic has closed due to unusual atmospheric conditions. The hole in Ozone was first identified by scientists in_________?

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The largest hole in the Ozone layer spreading over 1 million square kilometers above the Arctic has closed due to unusual atmospheric conditions. The hole in Ozone was first identified by scientists in_________?

A. February, 2020
B. March,2020
C. April,2020
D. May,2020