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Great Transformations - 60 minutes
From the development of the four-limbed body plan, the journey of animal life from water to land and the emergence of humans, Great Transformations focuses on the evolutionary changes that triggered the earth's incredible diversity.
Extinction! - 60 minutes
Some 99.9 percent of all species that have ever lived on earth are now extinct. Extinction! explores why, then confronts a frightening notion: Are humans causing the next mass extinction - the sixth in the history of life on earth?