Fossils are the remains of animals or plants that lived a long time ago.When we think of fossils, the first things that come to mind are the bones of dinosaurs; but a fossil can be anything.
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If the fossil was once an animal, the animal has to die.There are some rare places where a whole animal can be preserved.An animal that dies in a cold place, like the tundra, can be frozen.Fossils are found all over the world and on every continent.
A paleontologist is a scientist that studies fossils.
In the 1940s scientists developed a better tool for determining how old fossils were by using radioactive carbon isotopes.
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