Compared to 50 years ago, the thinning ozone layer has produced dramatic increases in cases of :
Compared to 50 years ago, the thinning ozone layer has produced dramatic increases in cases of :
1. asthma
2. color blindness
3. cataracts
4. skin cancer
Which of the above is/are correct?
(a) 1 and 2 (b) 3 and 4 (c) 1, 2 and 3 (d) All of these
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