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a
UV rays can cause cancer, skin aging mutation in cell
b
Polar vortex are formed all over the Antarctica to deplete O3 layer in the months of August and September
c
After the month of September replenishment cf ozone layer occurs at Antarctica
d
All of the above are correct
answer is D.
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Detailed Solution
UV rays can cause cancer, skin aging mutation in cell, polar vortex are formed all over the Antarctica to deplete O3 layer in the months of August and September and after the month of September replenishment of ozone layer occurs at Antarctica.