Question

What is a pollution .

Answer 1

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HERE IS YOUR ANSWER____

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Pollution is the presence in or introduction in to the environment of a substance which has harmful and bad effects.

OR

Pollution is when something is added to our environment which is harmful and poisonous to all living things.
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Answer 2

pollution is the presence of harmful substances and poisnious substances which are present in enviroment.
it can be in any form like water pollution, air pollution etc.