Answers

2014-06-12T10:54:51+05:30
Without oxygen we cannot live for a moment even.without oxygen the animal world will die away.trees make the oxygen and spread it in the air.while inhaling air we take the oxygen in and live forever.
carbondioxide makes our environment and rather our environment poisonous for us.trees consume this carbondioxide and thereby makes our environment safe for us.
trees also give us many benefits  like fruits, flowers , medecines etc.
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