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Because Now a days no one has reported even yet to saw a alive dinosaurs but it is believed that they were in the past because there bones found in the earth's crust
Scientifically it has been proved that there are no dinosaurs existing in these days but in very ancient days there were dinosaurs living.In these days it is impossible for us to see alive dinosaurs because of the change in the climatic conditions and the living habits of the dinosaurs.Thus there are no living dinosaurs in these days.