A journey through billions of years of Earth's past includes some of the planet's earliest life forms, from primitive bacteria to giant reptiles.
Cruising into the Cretaceous period, where creatures like the Tyrannosaurus rex dominated the planet; what happened to the dinosaurs; how other life forms survived an asteroid that crashed to Earth 66 million years ago.
Investigating the fossil record; scientists studying the Earth's past reveal clues about its future.
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