Which one of the following is not responsible for the extinction of a species ?

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Q: 58 (UPPSC/2014)

Which one of the following is not responsible for the extinction of a species ?

question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,26,35,26,15,9,11

keywords: 

{'extinction': [0, 0, 0, 1], 'species': [0, 0, 0, 2], 'narrow niche': [0, 0, 0, 1], 'broad niche': [0, 0, 0, 1], 'genetic variability': [0, 0, 0, 1], 'lack': [4, 0, 1, 7]}