पुथ्वी पर जीवन को सबसे अधिक खतरा है : (A) रेडियोधर्मी पदार्थों से (B) ग्लेसियेसन से (C) रेगिस्ता...

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पुथ्वी पर जीवन को सबसे अधिक खतरा है :
(A) रेडियोधर्मी पदार्थों से
(B) ग्लेसियेसन से
(C) रेगिस्तान के बनने से
(D) जंगल कटने से
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