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In the first of a two-part documentary, the naturalist explores the origins of life on Earth. Beginning the journey near his childhood home in Charnwood Forest, Leicestershire, he learns how a fossil discovery transformed scientists' understanding of the evolution of complex organisms, and in Newfoundland and Australia he reveals the earliest kinds of animal to exist on the planet. With the help of cutting-edge technology and visual effects, the programme brings the creatures to life, demonstrating how they survived
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