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It protect us from UV rays which comes from Sun and very harmful for living beings.If ozone layer is not on the Earth so we won't be able to survive as UV rays is very harmful to skin and plants can't grow in UV rays so we won't get oxygen and plankton won't able to grow in ocean so there will not be any food for sea animals and plants.
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Ozone layer helps to protect the earth from sun 
   but due to using eletronic materials our ozone layer is getting holes in in it
in the state of africa ther is no ozone layer therefore people are dark over ther

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