The release of which of the following into ponds and wells helps in controlling the mosquitoes ?

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Q: 323 (SSC/NA)
The release of which of the following into ponds and wells helps in controlling the mosquitoes ?
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,7,5,4,0,7,1

keywords: 

{'mosquitoes': [3, 0, 1, 1], 'ponds': [3, 0, 1, 1], 'dogfish': [1, 0, 0, 0], 'crab': [1, 0, 0, 0], 'gambusiafish': [2, 0, 0, 0], 'snail': [1, 0, 0, 0], 'wells': [2, 0, 1, 2]}