Выполнить , надо! 1)whot do you know about prehistoric life? about dinosaurs ? are there any mysteries about them? 2) were they alike? were they different ?

I know a lot about prehistoric life. For example, I know that many years ago there on the Earth lived dinosaurs! Dinosaurs are big creates, some of them were as big as houses. And of course all of them were different. Some dinosaurs were bid, another were small and so on.