मेलानोर्निया (त्वचा कैंसर) – McqOptions

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1.	मेलानोर्निया (त्वचा कैंसर) संबंधित है
A.	ओजोन संचय
B.	ओजोन का क्रमिक ह्रास
C.	अम्ल वर्षा
D.	एलर्जी
Answer» B. ओजोन का क्रमिक ह्रास

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