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Fossils: Video Short

Fossils: Full Show

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Fossils ['fŏ-səlz]
Fossils are the remains or traces of ancient life, naturally preserved in petrified form or cast in rock from the geologic past.

Scientists can tell a lot about the past by studying fossils. They can understand ancient climates and what creatures such as Idaho's extinct Hagerman Horse were like. Most fossils are the remains of extinct organisms, and usually consist of the hard parts of animals like teeth and bones. Sometimes fossilized footprints, nests, or leaf impressions offer clues that an organism was once present.

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