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‘Ozone-hole’ means

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in Biology by (106k points)

‘Ozone-hole’ means

(a) a large sized hole in the ozone layer
(b) thinning of the ozone layer
(c) small holes scattered in the ozone layer
(d) thickening of ozone in the ozone layer

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Correct answer is (b) thinning of the ozone layer 

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