We have two eyes to make correct prediction of distance between the object and to look everything in 3 dimensional.
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So that we can see more clearly and can see more
 on side.
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Badddd... that can be also reason but thats not the main reson
then bye i am not your friend and i am going to report you if you don't mark me as best
This what your friendship... that worked for not more then an hour :-P