Answers

2014-10-02T16:24:13+05:30
The answer is none bcoz forests are nt responsble but vehicals are responsible
in the same way it follows for next 3 options
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2014-10-02T16:24:14+05:30
answer- (1) coz forests don't give out any element that is used by air pollution whereas vehicles give out a lot of smoke
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