back to Grade 6+ DINOSAURS HISTORY by: MARYAM 4., Grade: 6+ DINOSAURS LIVED ABOUT 250 MILLION YEARS AGO. THERE WERE SOME DINOSAURS WHICH ATE PLANTS AND SOME ATE OTHER DINOSAURS. SCIENTESTS FOUND MANY TYPES OF DINOSAURS. I HOPE YOU INJOID READING MY ARTICLE...THANK YOU... back to Grade 6+