Answers

2015-09-15T18:32:18+05:30

we can protect the ozone layer through don't burring the fire crackers. I think that burring firecrackers is the main thing that harm the ozone layer
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thanks for sending me, do u have some more answers
2015-09-17T14:13:28+05:30
By daily release the waste from the body
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thanks but i already got the answer... and the programme is already over