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dinosaur

A dinosaur is an animal that lived on the earth a very long time ago. Dinosaurs were reptiles, and some of them looked like big lizards. Some dinosaurs were the largest animals that ever lived on land, but some dinosaurs were small and ate only plants.

fossil

A fossil is something left behind by a living thing that lived on the earth a very long time ago. Sometimes a fossil is a part of an animal's body--like a bone from a dinosaur or a backbone of a fish. Sometimes it is a pattern formed by shells or leaves that you can see in the surface of a rock. It is the rock itself that has preserved these things so that we can see them now, even after such a long time.

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