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Looks at the unique conditions that exist on Earth that make it an ideal place for life to flourish, discussing water, energy, and the atmosphere, and examines other moons and planets that have the four most important elements needed for life.

Collects episodes from the television series "Planet Earth," which features high definition filming of the natural world; and episodes from the series "Life," which features micro and macro photography that captures the adaptability and survival tactics of plants and animals.